Right Here (KTH)

Jimin's twin sister ends up losing her virginity to his childhood best friend, Taehyung, at a end-of-the-year high school party. The worst part? He pretends it never happened.

Years later, after a messy break up, she transfers schools to Jimin's. Unfortunately, Taehyung is there too. She makes all new friends, and even finds someone she might just hit it off with. Yet somehow Taehyung always seems to be there to mess it up.