
When a body in a strange posture appeared in the new sea Medical Center, each dead arm is engraved with a mysterious date number, a thriller hunting game officially opened. Major case team leader Chen Mingyuan and forensic doctor Gu Yuwen uncover, is not only a series of precision murder, but also a seven-year horrific medical experiment truth. A serial killer, code-named "The Scavenger," preys on late-night hospitals, where each body is perfect as a work of art, and each one leaves a gruesome warning. However, as they get closer to the truth, they discover that the killer may also be the victim himself - seven years ago, a secret personality reconstruction experiment code-named "Project Sequoia" split a living being into seven different personalities. When all the clues lead to the hospital's mysterious 404 room, they discover to their horror: this is not a simple story of revenge, but an elaborate game of death in which every participant could be a murderer and every murderer a victim. Even more frightening is that Chen Mingyuan's daughter was accidentally hospitalized and became the target of a new round of experiments. In this contest of life and death, who really holds the truth? And when the doors of Room 404 open tonight, what awaits them will be an unprecedented battle of personalities. A thrilling and suspenseful medical mystery, a dark story of humanity, redemption and revenge, plays out in the middle of the night at this hospital.

