Jongdae moved in with Baekhyun and Junmyeon in china a year ago after his parents died. Yet he can't seem to remember anything about when he lived in korea with his parents. They all go to the SM Academy High school for The Gifted. Jongdae was a super genius who seemed to exel in running because he never seemed to break a sweat and Junmyeon is the captain of the robotics team.  Jongdae follows after Joonmyun like a lost puppy,  he loves him because

he was programed to.