Xu Mu, a planner at Shangxin Advertising Company, has just experienced the sixth failed blind date. Once at a proposal meeting with Party A, Xu Mu met her high school deskmate Xie Shi again. Because of a drunken blunder, Xie Shi became the official boyfriend of Xu Mu's circle of friends. The two made a mistake and became a contracted couple and started a cohabitation life. However, what Xu Mu didn't know was that it turned out that all this was related to the boy's long-forgotten secret love.