Eversince Sehun started teaching, his only wish was to conquer Luhan, the craziest delinquent in the school.

Eversince Luhan became Sehun's student, his only wish was to get rid of that of a teacher.

After many years of fighting, Sehun's tired, Luhan's also tired. So they decided to peace it out:

Luhan should simply become Sehun's lover. It makes one less devil on earth.