Three years ago, partner Lin Lan disappeared mysteriously in an alley with no exit. The police concluded it was an "accident", but former criminal profiler Chen Mo never gave up the pursuit. Until a brass pocket watch that was a replica of Lin Lan's old belongings suddenly became hot, and the green light in the dark patterns drew him into a nightmare called "The World of Rules and Strange Tales."
When he woke up, he was in the corridor of Hospital No. 11 That smelled of disinfectant and rust. The rules announced by the broadcast are cold and biting: only by obeying the rules can you survive, and death or pollution will lead to the corresponding strange stories to come in the real world. The yellowed notes on the wall are full of contradictory rules. There is no shadow of the nurse in the white coat. The drag marks extend from one end of the corridor to the other, hinting at the tragic ending of the predecessors.
As the only "intruder" with memories of reality, Chen Mo must use the professional abilities of a profiler to find hope in the pursuit of the "shadow of the rules" and the confusion of true and false rules. The green light of the pocket watch sometimes guides the way out, sometimes warns of danger, and even unexpectedly reveals the clues Lin Lan left here - the handwriting behind the sketch, the medical records of the third ward, the "real rules" after the bell rings... Each clue points to the secret relationship between the hospital and the real world.
When personal obsession meets a life-and-death decision concerning the fate of the country, when rational analysis collides with the unreasonable logic of ghost stories, can Chen Mo find Lin Lan before the rules collapse and uncover the ultimate truth of the world of ghost stories? Behind every door in the hospital is the ultimate torture of human nature and reason.