He Yingcao has been dependent on her mother since she was a child, developing her tenacious character, loving to fight against injustice, and learned judo behind her mother's back. Many people have followed her since she was a child. She is equivalent to a "big sister", and everyone calls her sister Yingcao. Among them is a boy named Xu Chao, who is two years older than him. Xu Chao grew up in a single family, and the family is very rich. He likes Yingcao, but Yingcao only treats him as a younger brother who needs her protection. Later, when her mother found out about Yingcao, she took her away from the place where she grew up. She was 15 years old that year. In a new place and a new life, Yingcao resolutely changed in order to no longer let her sick mother worry about her. Later, a gentle boy (Chen Jiahao) accidentally saved her from a car accident. After getting along, they dated. She felt that it might be good if she could continue to live such a plain and warm life. However, during college, a "devil" named Li Yizhe broke into her life...