Han jisung

You and Han didn't get along well since he was your college bully, your dad had told you that he was going to marry someone else to which you got a little tense, days later your dad introduces you to your new stepmother, she greets you kindly, you just ignore her and go to your room, some time later your dad calls you to introduce you to your stepbrother, when you see him you curse quietly and Han tells you "oh nerd, it's you."