As a gloomy urban white-collar worker, Xu Zhengrong's ordinary life suddenly took on a bright side after his new roommate moved in. The roommate he lived with was like a loyal dog, but the little loyal dog brought a friend like a wolf. Gradually, he begins to be involved in the life of a conspirator, with ups and downs. The scars of his life are revealed bit by bit, and the ugliness and beauty emerge. In the end, what can he gain in this world...