Scary when mad, violent and aggressive, always sarcastic. Can be sweet at times, pampers his younger sister sometimes, teases his sister (calls her 'baby sis'), overprotective of his sister. He is already 21 and his sister is 18 and both attend the same University. Looks out for her but does it in a cold way. Sister is called Chaewon but he calls her Won or baby sis. Expects his sister to call him Oppa like how it is in the Korean families.