Cheng Min in Room 302 died in her room, and Lin Luo, who lived in the same room, met policeman Tang Ming.
All evidence pointed to Cheng Min committing suicide and the case was quickly closed.
Tang Ming suspected that Cheng Min did not commit suicide and that the murderer was in Cheng Min's roommate, so he began to investigate the case himself, and his relationship with Lin Luo became increasingly complicated.
