Female, 17 to 18 years old, a plain and simple girl next door, a “little joke”“ in the eyes of classmates, and a ”catalyst“ for the harmony and stability of ”ice“ and ”fire“.She is an ordinary girl with an average family background and is happy-go-lucky. She becomes the ”post-it% girl in the class because she doesn't know how to refuse.Because of this, he was accepted as his younger brother by Lan Jinghui and was dragged into the competition between Lan Jinghui and Ling Dong. They gradually formed a three-person study group and grew up together.