When Seoyun was young, his father Kenchi died and his mother had to raise Seoyun alone, which meant that money was always tight. Seoyun never really had much money and learnt that most people looked down on him, which turned Seoyun into a cold and rude badboy that almost everyone was afraid of because of his appearance. Seoyun is always involved in fights with others and doesn't seem to care about his own well-being, but always wants to be seen as a strong and independent loner.