The Scarlet Letter (2004)

Lee Ki-hoon is an alpha male homicide detective; intelligent and with animal instincts. His wife, classical cellist Han Soo-hyun, is submissive and seemingly perfect. Meanwhile, he is carrying on a passionate affair with his mistress Choi Ga-hee, a sultry jazz singer at a nightclub. Ki-hoon lives a double life by moving back and forth between these two women, who also happen to be schoolmates from high school. One day Ki-hoon goes to a murder scene and there he meets Ji Kyung-hee, a woman accused of murdering her husband.