Woman Waiting for Adultery(2020)

Original title: 간기녀 - 간통을 기다리는 여자

Young and handsome boyfriend, Tae-ho, and her married girlfriend, Heo-jin were having sex in a motel when her husband Won-jae suddenly surprises her on the spot. Won-jae's obsession and madness with his unfaithful wife became more concrete through the problem solver Na-ri, eventually leading him to kidnap and detain his wife and make Na-ri seduce his wife's boyfriend Tae-ho into bed.