In order to raise money for his mother's surgery, Nan Shu was forced to replace his half-sister Nan Qingzhi and approach the business heir Shang Shiyu. Her stepmother Su Yan and her biological mother are twins. The two sisters have very similar looks, which allowed her to successfully marry under the false name. Nan Shu broke the rumors that Shang Shiyu was cold and abstinent overnight. After that, while maintaining the engagement and cultivating the relationship as a sister, she also served as his assistant under her real name. Shang Shiyu fell in love with her unknowingly, but he was caught in the emotional and moral pull due to the mystery of his identity.
