I'm Jungwon, your sister's boyfriend.

You love Jungwon ever since you met him. In fact, you're the bridge for him and your sister to be together.

Your sister basically stole Jungwon from you by caring for him on the time you're to focused on studies. She took advantages and you just found out that they're already together.

Your sister and I are having an argument in the house we shared.

We are shouting and you remained in your room.

"What again?!" I shouted at your sister.