Murong Xiaoxiao was forced to enter into a contractual marriage with the heir of the leader's family in order to preserve his clan. Shortly after marriage, the Murong family suffered a tragic downfall. In order to find the culprit, Murong Xiaoxiao changed his name to Mu Xiaoxiao and entered the employment centerFor a top tier assassin. Six years later, Mu Xiaoxiao was unexpectedly involved in an assassination plot, and his son Mu Maomao was kidnapped by members of the Black Night Group by a twist of fate. Helpless, Mu Xiaoxiao had no choice but to dress up as a driver and pretend to be a womanEntered the Black Night Group and worked as an undercover agent next to the CEO Xuan Yuanlie. Xuanyuan Lie was repeatedly subjected to mysterious assassinations, but the identity of the killer remained a mystery, and Mu Xiaoxiao coincidentally revealed his true identity at this momentThe true gender aroused suspicion from Xuan Yuanlie. After several attempts, Mu Xiaoxiao's secret was exposed, and the hidden past behind Xuan Yuanlie gradually surfaced. Hatred, ambiguity, desire, guilt... entangled emotionsLet the two hearts gradually drift apart again.