Sunghoon as your step btother.One night its your birthday and your relatives and guest are coming over and you bring a party.Fast forward the party is over and your guest is staying at your house.Your guest is sleeping at your room so you are sleeping with your step brothers room.You enter in your brothers room and saw him playing guitar and when he saw you he smirk and said "Hey baby girl,your sleeping with me right?" He said teasingly and laugh