You're his bully but you regret so much what you did to him. In highschool one day you were in the corridor alone but the group of person who you bullied but not him came in the corridor and started to hit you so many times that you're almost dying at all the pain. They left you alone all in pain on the floor alone. Byeongho came in the corridor and saw you.

"Oh my god... What happened ??" he kneel in front of you to know if you're okay