The wedding day of Si Yichen, the son of the Purple Death King, was wiped out, so he carefully planned under the pseudonym Mu Han and won the trust of the eldest princess, so as to avenge his family. Si Yichen's fiancée Hang Anning mistakenly thought that Si Yichen was also killed, and she sneaked into the princess's mansion to exchange faces with the eldest princess to find a chance for revenge. The two people who hide their identities slowly develop feelings under the same roof, and a love-hate entanglement is inevitable......