Mu Xiaoyu is a freshman this year. She suffered from an eating disorder due to weight loss a year and a half ago. She has been hiding it from everyone. Because of a chance encounter, she fell in love with Li Chen, a sophomore boy.
Liang Sisi and Su Shu are her roommates and friends. For some reason, Liang Sisi and Su Shu have a better relationship. They joined the guitar club because of a senior who Su Shu had a crush on and is now the president of the guitar club. And that senior happened to be the sophomore boy Li Chen.