Originally living a happy and stable life, things have become clouded for rich heiress Ye Shuang after the unexpected disappearance of her husband Ling Feng and daughter. After consulting with her father Ye Cheng, Shuang decides to call the police, where she re-encounters her ex-boyfriend, Yao Jie. During the investigation process, Jie finds this million-dollar ransom kidnapping case to be a misty mystery. Specializing in investigating by starting from minor details, he targets Cheng as a potential suspect. At this time, Cheng's activities have also become suspiciously strange. When the mystery seemed to have dispersed, Cheng dies from an accident. At this time, clues from a murder case that took place 20 years before begin to surface. Behind those clues, the mysteriously kidnappers actually have an ulterior motive.