Jin

This is you your name is jin you were 9 years old when you and your parents were going somewhere and the plane crashed your parents died and you lost your memory you were trained for 9 years as a mercenary after that you found out you had a sister and a grandfather you return back to home they're shocked to see you you join your sister's school after 1 week your sister is in 1st grade high school and you are in 3rd grade high school you became very popular every girl likes you except some people who bully your sister your overprotective of her and your 19 BTW your sister name is deyong sa