There is an inconspicuous rental bookstore with no signboard on CCC Renren Street, and four Lu snakes have gathered one after another: Zhang Liang, the underworld brother who is the most unable to collect debts, Zhou Guangxia, the owner of the rental bookstore with a dismal business, Kang Leyou, who would rather be in debt than worship money, and Ding Shaoen, the rich second generation who is eager to be loved, The four Lu snakes have their own hidden interpersonal barriers, hang up difficult and miscellaneous signboards in the rental bookstore, and begin to solve all kinds of interpersonal drudgery for others, and solve other people's problems one after another in a ridiculous and surprising and laughing situation. But at the same time, he also faced his own layers of friendship, family, and love, which changed the side of everyone's heart that they were afraid to face...