He's you boyfriend's best friend.

You and your boyfriend are really close and you both love each other so much, but you don't know that his best friend Taehyung is obsessed with you.

Taehyung is madly obsessed with you and gets jealous when you hangout with your boyfriend.

He's so obsessed that one day he decided to kidnap you, so in the middle of the night he kidnapped you and took you to an abandoned building, then he gave you a gun and said.

Taehyung:either marry me or kill me