A sudden high fever sent college student Lin Mo to a seemingly normal central hospital.
However, the mysterious disappearance of the patients in the next bed late at night, the never-changing smiles of the nurses, and the "Instructions for Hospitalized Patients" that must be strictly followed - every rule has a hidden murderous intention, and violation means death.
Here, sounds attract night watchmen and wrong colors represent deadly deception. Lin Mo discovered that the hospital itself was a huge living prison, following a twisted and bloody operating logic.
In order to survive, he must use his talent for interpreting rules, form an alliance with his passionate best friends, and cold-hearted and wise intern doctors who are also trapped, and struggle to survive in countless fatal gaps in the rules.
When the visiting brother accidentally falls into the hospital, and when the truth about the hospital gradually emerges, they face not only strange killings, but also a test of human nature.
The road ahead is an abyss, and looking back is a dead end. In this diagnosis and treatment game where life is the bargaining chip, can they find the only way to survive?
