The First Choice — Mainline 02: Behind the Door — AI Backrooms Horror Segment
Final Video: The First Choice — Mainline 02: Behind the Door
The First Choice — Mainline 02: Behind the Door is the second segment of The First Choice, a 12-second vertical 9:16 photoreal horror segment built inside the same interactive Backrooms world. The player is still inside the yellowed office; the door has just been struck from the other side. Through the narrow gap under the door, a party balloon shadow passes, and a blocky smiling silhouette settles outside. Then the thing behind the door speaks: “I know you’re in there.” A pause. “Choose a color, and I’ll lead you out.” The segment ends on the door still closed and the face still hidden — the exact frame the audience is asked to choose from.
Nothing is generated as text: the shot is played straight, and the two Chinese lines are burned in as subtitles in post. Every frame is first person — the camera is the player’s eyes, and the only body we ever see is a worn knit sleeve and a hand pressed to the wood. The party colours stay just out of reach, used as a threat rather than a joke.
Play the finished segment: The First Choice — Mainline 02: Behind the Door →
The Video
720×1280 (9:16) · 12s · one continuous first-person take — rendered by Seedance 2.0 Fast in image-to-video mode from this world’s own two locked references (the office plate and the Partygoer identity sheet). Photoreal live-action 3D horror-game grade: charcoal-black shadows, acid-yellow fluorescent edge light, low saturation, dirty film grain, slight lens softness and mild compression. The party colours — red, blue and yellow — are the only saturated thing in frame and are kept as a threat. Sound effects and dialogue only, no music.
How It Was Made
Production Process Breakdown
Everything starts on this world’s board in Neta Studio, where the grammar is locked in one line: <strong>photoreal live-action 3D horror game</strong> — charcoal-black shadows, acid-yellow fluorescent edge light, low saturation, dirty film grain, slight lens softness, natural motion blur and mild compression, with saturated party colours allowed only as a threatening contrast. Never comedic, never an illustrated page. That single rule carries into every segment.
Before any motion, two stills were locked. The <strong>office plate</strong> fixes the first-person yellow backrooms office: yellowed wallpaper, damp carpet, a CRT leaking grey static, a boarded window and one closed wooden door with a tarnished handle. The <strong>Partygoer identity sheet</strong> fixes the creature — a tall yellow humanoid, blocky head, dark-red painted smile, long thin arms ending in closed tooth-lined openings, and a clutch of glossy balloons. Those two frames are the DNA of the segment and the images handed to the video model.
The opening take was rendered first: 10 seconds, one continuous first-person shot from a white wake-up flash into the dim office, ending as the camera drifts to the closed door and its tarnished handle turns slowly by itself. Rendered with <strong>Seedance 2.0 Fast</strong> from the office plate and the Partygoer sheet.
This segment is the axis of the whole episode. 12 seconds in one unbroken first-person close-up of the door and its narrow lower gap: a fast sequence of aggressive impacts, a round balloon shadow passing over the gap, then the blocky smiling shadow settling outside. A hard cut, and then the Partygoer speaks from the other side in two clear pauses with a sharp, electrically distorted voice — <em>“我知道你在里面。… 选一个颜色，我就带你走。”</em> — while the face itself stays hidden behind the closed door. The two lines are subtitles added in post, never generated in-frame.
Kept on the board from an earlier pass of this world: an 11-second corridor-and-elderly-figure sample that established the photoreal first-person look, the cold fluorescent palette and the “figure standing too still” blocking. It is not part of the finished episode, but its palette and camera height fed straight into the office plate — a reminder that the world was found by rejecting takes, not by getting it right first time.
A 4-second hold was rendered as the interaction point: the same door gap, the same motionless shadow and one balloon, the fluorescent light flickering while the shadow stays unnaturally still — deliberately composed with clean negative space in the centre so the three circular choice buttons could be composited in post. No dialogue and no on-screen words are generated in this take.
Each colour branch was then rendered as its own 6-second take from the same locked references: <strong>red</strong> — the door creaks open and the smiling mask rushes the lens before a burlap sack blacks the frame; <strong>blue</strong> — the camera backs away and pitches through the boarded window, hard-cutting back into the identical opening room as a loop; <strong>yellow</strong> — the Partygoer hands over a single balloon and pulls the player through into a bright, wrong party corridor. Keeping them as separate renders let each ending keep its own sound design without contaminating the others.
Because every segment was rendered separately, the cuts stay hard and the continuity stays exact. The mainline, the choice beat and the three endings were stitched into one interactive web player — a video element, a small HUD and a colour-choice screen — and published instantly to a shareable link that plays in any browser, no download. The segment you are reading about is Mainline 02: 12 seconds, one take, subtitles in post.
Generation Prompt
Model: Seedance 2.0 Fast — image-to-video, 12 seconds at 720×1280 (9:16), from the world’s two locked reference frames (the first-person yellow backrooms office plate and the Partygoer identity sheet).
Full render brief — Mainline 02 “Behind the Door” (12s):
12 seconds. Vertical 9:16. Moving-image version of the same series pitch-page visual language: photoreal live-action 3D horror-game cinematic, charcoal-black shadows, acid-yellow fluorescent edge light, low saturation, dirty film grain, slight lens softness, natural motion blur, mild compression, colorful party elements as a threatening contrast, never comedic and never an illustrated page.
Reference image 1 is the fixed first-person yellow backrooms office scene. Reference image 2 is the fixed Partygoer identity reference; use the same tall bright-yellow humanoid, blocky head, dark-red cartoon smile, long thin arms and colourful balloons. Do not render the pitch-board layout, borders, title cards, readable text, subtitles or UI; dialogue subtitles will be added in post.
0–6 seconds: first-person extreme close-up of the closed wooden door and its narrow lower gap. The camera is inside the office, the worn sleeve is barely visible at the bottom edge. A fast sequence of aggressive impacts hits the door. A round colourful balloon shadow passes over the gap, then the shadow of the Partygoer's blocky smiling head settles outside. Keep the Partygoer mostly hidden behind the door; reveal only the wrong silhouette, balloons and a hint of the yellow suit.
Hard cut.
6–12 seconds: the door gap remains in close view and the Partygoer's shadow does not move. The Partygoer speaks from the other side in two clear pauses, with a sharp high cutting voice, severe electrical distortion and a muffled wall between the voice and camera: "我知道你在里面。" Pause. "选一个颜色，我就带你走。" The dark-red smile shadow tilts slightly too far at the end. Keep the face itself obscured by the closed door.
Sound effects and dialogue, no background music: fast aggressive knocking, balloon rubber rubbing, a warped toy-loudspeaker burst, then the exact Chinese lines spoken by the Partygoer. The voice is eerie, sharp and hostile, never cute and never comedic. Add a faint distant human breath behind the door, but no extra dialogue. No readable text, no captions, no logos, no watermark, no gore, no duplicate creature, no extra limbs.
Asset Prompts
A clean vertical 9:16 first-person scene reference for a photoreal live-action 3D horror game. Use the attached image only as a reference for the strange empty indoor play-space palette, repeating corridors, colored party objects, and unsettling false cheerfulness; ignore its collage layout, phone framing, social-media watermark and any text. The scene is a dim backrooms office at night: yellowed wallpaper, damp carpet, a messy desk with scattered papers, an old CRT monitor showing grey static, a wooden chair, a boarded window with rough planks, and a closed wooden door with a tarnished metal handle. The room should feel real, neglected and slightly too empty. A few faint reflections of red, blue and yellow party colors leak under the door, but no creature is visible in this reference. First-person framing with only the very bottom edge of the viewer's worn sleeves visible, ready to interact with the handle. Low saturation, sickly fluorescent ceiling light, deep corners, slight lens softness, natural film grain, mild compression, no HDR, no beauty filter. No text, no UI, no captions, no watermark, no people, no balloons inside the room.
A clean character reference sheet on a pure white background, four consistent views arranged left to right with even spacing: front, three-quarter, side, and back view of the same original horror creature. Use the attached images only as visual references for the yellow party-creature design; ignore their phone black bars, platform UI, subtitles, watermarks, and any other people. The creature is a tall, broad-shouldered bipedal humanoid with smooth bright yellow leather-like skin or a skin-tight yellow suit, long thin noodle-like arms, and a blocky rectangular head. Its face is a flat cartoon smile painted in dark red, like dried blood, with no visible nose and no normal mouth. The smile is the only facial feature. The ends of its long arms are not human hands: each ends in a narrow tooth-lined opening, shown non-graphically and closed in the neutral pose. A few small colorful party balloons and a short paper streamer are included only in the three-quarter view as prop references; do not add props to the other views. Its proportions are subtly wrong and its posture is too still, creating false cheerfulness and unease, never comedy. Photoreal live-action 3D horror-game creature render, realistic worn material, slight grime, soft studio lighting, muted yellow and red palette with restrained color accents, consistent anatomy and costume across all views. No text, no labels, no borders, no watermark, no duplicate creature, no extra limbs, no gore, no cartoon illustration.
A vertical series pitch page for a screen story, laid out as one dark ornate printed page. The whole page is near-black charcoal black, edged with a thin double rule and small ornamental flourishes at each corner. Body text is warm cream; headings and ornaments are acid yellow. The three photographic images on this page are photoreal live-action film stills in full colour — real skin texture, real fabric, film grain, true photographic depth of field. No illustration, no painting, no drawn or cartoon look inside them. The page furniture — rules, ornaments, panels, type — is flat print laid over the dark ground. The world in every image is the same: a dim yellowed backrooms office at night, sickly fluorescent light, damp carpet, a boarded window, and repeating party colours leaking from the darkness beyond a wooden door. The recurring figure is a tall bright-yellow humanoid Partygoer with a blocky head, a dark-red painted cartoon smile, long thin arms ending in closed tooth-lined openings, and a few colourful balloons; the same figure appears in every photograph. Upper left, the title is set very large across three stacked lines in an elegant high-contrast display serif with tall capitals, reading "THE" then "FIRST" then "CHOICE". Directly beneath it a small widely letterspaced line in acid yellow reads "BACKROOMS HORROR". Beneath that, flanked by two tiny ornamental fleurons, a line reads "Episode One: The Party Door". Upper right, one large atmospheric photograph of a first-person view of a closed wooden office door with a narrow gap beneath it, the shadow of a tall yellow party creature and round balloons waiting on the other side. It is big: it fills the whole upper right of the page, stands as tall as the entire title block beside it, and takes up nearly half the width of the page. It has no frame and no border at all: its edges darken and dissolve softly into the black page so there is no visible boundary. The lower half of the page holds two bordered panels side by side, each edged with a thin rule and small corner ornaments. The left panel is a vertical list of four very short entries. Each entry has a small acid yellow line-art emblem at its left and one short line of small cream text beside it, never more than about eight words, and each entry is separated from the next by a thin horizontal rule with a tiny diamond at its centre. The four entries read, in order: "Wake inside the yellow room" / "The door handle turns" / "A smile waits outside" / "Choose red, blue, or yellow". The right panel is headed by a small widely letterspaced line in acid yellow reading "EPISODE ONE", with a small ornament beneath it. Under that heading are four stacked entries. Each entry has, at its left, a small diamond-shaped badge holding a numeral, then a large rectangular photograph that takes up about half the width of the panel and is clearly the biggest thing in its row, and to the right of those a heading in small serif capitals with one very short line of small cream text beneath it. The four entries are: badge one, a photograph of a first-person view of a dim office with an old CRT monitor, messy desk, boarded window and damp carpet, heading "WAKE UP", text "The room hums around you."; badge two, a photograph of a tarnished metal door handle turning slowly under sickly fluorescent light, heading "THE HANDLE", text "Something is already outside."; badge three, a photograph of a narrow door gap with the shadow of a colourful party mask, balloons and streamers beyond it, heading "THE VISITOR", text "It knows you are inside."; badge four, a photograph of three coloured circular buttons red blue yellow in front of a closed wooden door, the party shadow still visible through the gap, heading "THE CHOICE", text "Every colour has a price.". Each heading and each photograph belong to the same entry and match each other exactly. Along the bottom, centred, one widely letterspaced line reads "CHOOSE A COLOUR", and beneath it one short line of small italic cream text reads "Heartbeat · static · knocking · laughter". In the bottom left corner a large dark balloon string illustration curls into the margin, and in the bottom right corner an ornate monogram cartouche holds the single letter "P". Every piece of text listed above is spelled exactly as given and written once only. There is no other text anywhere on the page — no page numbers, no captions beyond those given, no signature, no watermark, no gibberish lettering, and no invented words.
Vertical 9:16 first-person POV film still from a photoreal live-action 3D horror game cinematic. We are looking through the eyes of a person standing in a long yellowed liminal corridor: damp-stained mustard-yellow wallpaper covered in long dark scratches, identical reddish-brown doors repeating down both sides, a wet patch on the tiled floor, and the corridor receding into pure black at the far end. A single fluorescent tube overhead flickers. At the bottom edge of the frame the viewer's own hands and white shirt sleeves are visible, one hand half raised. Cold sickly green-yellow fluorescent light, deep shadows, heavy 35mm film grain, slight lens softness, shallow depth of field, natural motion blur, no HDR, no beauty filter, no text, no captions, no user interface, no watermark, no logo. Photoreal: real skin texture on the hands, real worn wallpaper fibre, real grime.
A character reference sheet on a clean flat pure white background, four figures arranged left to right with even spacing: front view, three-quarter view, back view, and a close-up of the head. The character is the same man in all four: an elderly man in his late seventies, gaunt, slightly hunched, thinning grey hair combed back, waxy pale skin, heavy-lidded tired eyes, wearing a faded blue short-sleeved shirt with a small dark floral print and dark trousers, plain dark shoes. He stands perfectly straight and unnaturally still, arms hanging at his sides, face neutral. There is something faintly synthetic about him, as if a real person had been rendered. Photoreal live-action 3D horror-game character render: real skin texture with visible pores, real fabric weave, subtle film grain, soft even studio light, full colour. No text, no labels, no borders, no frames, no watermark, no props, no extra figures, no duplication, no distortion.
Reference Frames
Why Choose Neta Studio
Neta Studio turns one board into an episode. Build the world, lock the look with image models like GPT Image 2, then hand the exact reference frames to video models like Seedance 2.0, Seedance 2.0 Fast, Kling, MiniMax H3 and Veo — and every take comes back with the same office, the same creature and the same fluorescent grade, so separately rendered segments cut together as one film.
Direct a fixed set like a real shoot. One room, one creature, one strictly first-person camera and a story that branches three ways — Neta Studio holds all of it across 4-, 6-, 10- and 12-second takes, keeps the earlier rejected passes on the board, and lets you switch model mid-episode. Subtitles, HUD, choice buttons and the interactive player are added in post; the share link plays in any browser, no download.
Studio Interior
Start Creating
The First Choice — Mainline 02: Behind the Door was generated by Neta Studio AI from two locked reference frames and one written prompt — the world board, the reference stills and every take took minutes. You can do it too: build the same Backrooms world or start fresh from any idea. No coding required, free to start.