On a dark rainy night, an abandoned and unknown body was found in a remote alley. The police initially determined that this was an ordinary murder case, but Chen Yu, the senior criminal police officer in charge of the case, discovered a detail at the scene that was similar to a disappearance case many years ago. That disappearance case has always been on his mind, because his fiancée mysteriously disappeared in that case... As Chen Yu gradually investigated in depth, he began to discover that everyone around him seemed to be hiding something. Every step he took to get closer to the truth put him in a more dangerous situation.
