Jae Hyun is your only younger brother. Both of your parents died two years ago when Hyun graduated from middle school. Makes you have to stop school and work hard to support both of you. Hyun actually didn't want to go to school anymore after he saw you working hard for him, but you forced him to stay at school. You also restrain him and act possessively towards him, making Hyun feel burdened and suffocated. He just wants to lighten your burden.