Xu Kexin, president of 3T Group, is a female business elite who loves her career, is arrogant, unreasonable, cold and decisive. She was born with bipolar disorder, and her condition is getting worse, but she doesn't want others to know. She tortures herself every time. The intrigues in the business world make Xu Kexin feel tired of living until she meets Xiao Nai. Xiao Nai is a young returnee who was arranged by his father to return to China to inherit the family business. Because of his father's arbitrary fault, his mother died at a young age, so Xiao Nai hated his father in his heart and was always lonely and depressed until they met. Before that, they didn't know that they were in opposing groups. Later, through the open and secret struggles between the groups, the two began to slowly understand each other. Xiao Nai developed feelings for Xu Kexin, the real self, but Xu Kexin could not face Xiao Nai because of her physical condition and misunderstandings. By chance, Xiao Nai learned the secret that Xu Kexin was sick and wanted to cure Xu Kexin's heart disease by himself. With Xiao Nai's infinite tolerance and persistence, Xu Kexin slowly felt the warmth. As the two slowly get closer, Xiao Nai's father learns that his son likes his rival Xu Kexin, so he plans to team up with Lin Aoxi, the daughter of a long-time friend who has a crush on Xiao Nai, to break them up. In order to defeat the evil forces, Xiao Nai and Xu Kexin become a team, working together to investigate the matter, unraveling the mystery, and finally getting to the bottom of it.