The man lies on his back on the sofa, looks out the window at the lonely night sky, and begins to recall the past. This man, named Yang Li, is 177cm tall and thin. Thanks to his training, he is still well maintained at 30. After graduating from the police school, he did not enter the police department or work in government agencies like most of his classmates. Instead, he chose a challenging private detective as his preferred occupation. From a rookie at the beginning of his career to a well-known private detective, he once made tens of thousands of dollars a month in good times. Of course, high income is accompanied by the need to bear the high risks of various cases. It was precisely because of Yang Li’s mysterious and passionate career that Siqi, a student of business school at that time, was infatuated with him, and eventually they fell in love. His wife, Siqi, is 3 years younger than her husband Yang Li. At school, although she is not at the school flower level, she is also one of the top beautiful women in the college.