When Gu Nian's family faces a financial crisis, his father and stepmother pressure him to marry the daughter of the Wang family. To sabotage the arranged marriage, Nian picks up a scruffy homeless man, Lin Xiao, from the streets and claims he is his boyfriend, causing chaos. Little do they know that Xiao is actually a rich heir who just returned from abroad, hiding his identity to investigate a family scandal, and that he is Nian's childhood friend he has a marriage pact with. Xiao cleans up and happily plays the role of his boyfriend, but Nian's family still constantly tries to humiliate him. Xiao handles it with ease, proving his worth. With Xiao's help, Nian uncovers the mastermind behind the illegal attacks on his family's business, Li Yan. As Nian gradually falls for Xiao, Xiao's true identity brings about a shocking twist...