The prince of the Southern Dynasty, Nan Zihong, chose Wang Sifan, the least favored daughter of Prime Minister Wang, because of his strange habits. He didn't care at first, but he fell in love with her at first sight at the Chinese Valentine's Day banquet. In the process of falling in love with only one person, this relationship was destined to fail. Wang Sifan didn't particularly like him, so a sadomasochistic relationship began.