My Husband's Woman (Korean: 내 남자의 여자; RR: Nae Namjaui Yeoja; lit.

[4][5] Ji-soo (Bae Jong-ok) is an unassuming housewife leading a happy life with her college professor husband Joon-pyo (Kim Sang-joong) and their son Kyung-min (Park Ji-bin).

One day, Ji-soo hosts a barbeque party at her house and invites Hwa-young and her sister Eun-soo (Ha Yoo-mi).

Shocked and sickened to her stomach, yet nervous about what her fragile sister might do if she ever finds out, Eun-soo threatens Hwa-young and Joon-pyo to end the affair immediately.

In the aftermath of the revelation, the psychological warfare begins, and to retaliate, Ji-soo decides to have an affair herself with her old college friend Seok Joon (Lee Jong-won).