Shen Yan and Lu Zhao reunited in a wooden house in the mountains blocked by a snowstorm.
Former detective Shen Yan came to investigate the disappearance case, but a mysterious visitor Lu Zhao showed up with the same destination. As soon as the wooden door was closed, the roar of an avalanche was heard outside. The only way down the mountain was completely cut off, and the wooden house became an isolated cage.
Late at night, the wealthy businessman who lived with him died mysteriously in a locked room, with a half-marked wooden sign inserted into his chest. Immediately afterwards, the second body appeared, and the other half that matched the wooden sign was found in Lu Zhao's luggage. Suspicion spreads like a plague, everyone hides secrets, and the faint footprints in the snowstorm point to an even weirder truth.
When a note that read "Twelve o'clock at midnight, the last person will be revealed" was posted on the door, Shen Yan finally discovered that the seeds for this dilemma had been laid ten years ago. They are the pursuers of the murderer, and they are also the murderer's prey.
