Friends or F-buddies

Hyunwoo, Yiseul, Nayeon, and Jimin, who were once inseparable friends, unexpectedly cross paths in college. The unexpected encounter is filled with uncertainty, as some members of the group are not entirely happy about the reunion. They notice that everyone has undergone physical and personality changes, leaving Hyunwoo to ponder the controversial question: Is it acceptable to have a sexual relationship with your friends?