Su Mu still can't figure out why her heart suddenly moved at that moment that day, why she became obsessed with him and couldn't extricate herself from it.
She thought, maybe there is really no reason to like someone, right? Or maybe this is like what the book says: you have known some people since you were a child, but you have never thought about whether you like them or not. However, at a certain moment one day in the future, I suddenly had a special feeling for him. But that momentary throbbing will be eternal.