Dear Mr Killer (BTS K.T.H) [COMPLETED]

Kim taehyung (18), who has bad attitude and always use Lieun which is his junior as his victim of bully without any reason. Kim Lieun (17), has a problem with her mom or could be known as stepmom. Doesn't have other siblings. She is the fav of Taehyung when it comes to bully. What would be happen after found out the...