Yeonjun is Jisoo's older brother and Jisoo is dating Beomgyu. Beomgyu is sweet and funny and often hangs out at Jisoo's house and spends time with Jisoo. Yeonjun is Jisoo's problematic older brother. Yeonjun goes to parties, participates in illegal racing, smokes and has his own motorcycle.

Beomgyu doesn't really like Yeonjun, but tolerates him because he's Jisoo's older brother.Beomgyu was sitting on the couch with his girlfriend watching a movie, but Yeonjun returned home from a party.