Su Xi and Ling Jiuzhe have been married for three years, but they have never met, and few people know about it. At night, Su Xi is the president's wife, lying in Ling Jiuzhe's villa, petting his dog, and lounging on the sofa he designed and custom-made. During the day, she is the tutor he hired, earning his salary, watching his moods, and being at his beck and call. However, while he can be moody with her, others cannot. When someone insults her, he stands up for her; when someone bullies her, he deals with them decisively and mercilessly. Gradually, everyone realizes that Ling Jiuzhe treats Su Xi differently, with a care that seems more than just the affection of an elder for a junior. It is so sweet and doting that he, who was once a ruthless bully, has become even more ruthless and decisive for her. Some also notice the changes in Su Xi, such as her wearing jewelry worth thousands despite her originally modest background.