Jin Shanyou is the son of a wealthy family. His mother is a police sergeant, so he has practiced martial arts since he was a child (lifting fist, kendo, karate...). But because of the lack of family affection, he felt lonely and always wanted to attract the attention of others. He used technology to become the police's nemesis thief. The most interesting thing was that the things he stole were returned the next day and he began to play tricks on the police. His behavior attracted the attention of female high school student An Youtian (young policewoman). Start arresting him. Since then, the two of them have been nicknamed: Black-faced Thief and Black-faced Detective. ． ． ． ． ．