After the two girls' colleges where the heroine belongs merged, she bumped into a boy at the subway station on the first day of school, and then she fell in love with him? The male protagonist gets into a fight and becomes a junior after failing a grade... In the early stage, the girl chases the boy. The female protagonist conducts various "investigations" secretly, thinking that the male protagonist doesn't know anything? Doesn't exist! The male protagonist looks calm on the surface, but in fact he has a lot of inner dramas and all kinds of secret jokes! In the later period, the male protagonist dotes on the female protagonist!