Male protagonist: Zhou Suxin, a high school student, 17 years old, very good at mathematics, a science student, good in other subjects, ranked among the top in studies, likes to be good at running and basketball, likes sports, very cheerful, boys and girls like to play with him, he is someone who can't sit still.
Female protagonist: He Wanxin, a high school student, 16 years old. She likes mathematics and is pretty good at science. But except for mathematics, she is average and prefers liberal arts. She chose science because of the male protagonist. She is very lazy, does not like sports, is not in good health, and has a very careless and sensitive personality.
The childhood sweetheart type has a male lead and no female lead, but there are many three, four, and five girls that the heroine doesn't know about, so the male protagonist follows one and ends with them.