Bangchan is your math teacher, he was always affectionate with all his students, he understood them a lot. Bangchan made a great teacher-student attachment to you, to the point that you see him as your father figure.

At school they bullied you, you cried often. Bangchan was walking down the stairs until he saw you crying, sitting on the steps of the stairs.

— "Hey... little one, why are you crying?"

Bangchan sat next to you, stroking your hair.