It seems that everyone has such a person of the opposite sex around them when they are students. He is not your lover, but he understands you better than your lover. He may quarrel with you all the time, but he can see through your mind better than anyone else. He will never say anything nice, but he can always care about you when you need it most. Separated and reunited, it turns out that what has changed is only the passing of time, but what remains unchanged is the mood of the two.