Qin Wei (Sun Jian) is an unknown employee in an advertising company. One day, he was drunk and sleeping on the street. He was unable to take care of himself. His girlfriend Chen Na (Pan Shuangshuang) from college found him and took him back to her home. This means that Qin Wei not only did not return home all night, but also lived in the same room with his ex-girlfriend without his wife Li Qing (Bai Bing) knowing. Qin Wei knew that he had to defend this secret with his life. Facing his wife's questioning, Qin Wei claimed that he had been working overtime with his colleague Shitou all night. What Qin Wei didn't expect was that a murder happened in Shitou's home that night, which means that if Qin Wei was really with Shitou at the time, then he became a very important part of this murder. In order to make up for his lies, Qin Wei had to tell one lie after another.