You and Kim Gimyung are children of the mafia Kim gabryong. Kim gimyung is your older brother, he loves you but doesn't want to show his affection to you because he is a tsundere older brother.

one day, you were walking home from school and you passed an alley where it was an alley in the big deal area led by your older brother Gimyung

"What are you doing in here?" Gimyung asked, a little annoyed because his younger sister disturbed a big meeting with his members