Duet - Season 1

Han Su-Seol (Jun Sung-Hwan) is a wealthy, conservative professor. One day, while he is being driven home, a woman and a girl stand in front of his car. The woman is his pregnant daughter-in-law Choi Yeong-Ae (Shim Yi-Young) and granddaughter (Jung In-Seo). Choi Yeong-Ae defected from North Korea, before meeting his son (Jo Jae-Wan) and marrying him. At that time, Han Su-Seol disowned his son for marrying her. His son later died in an accident. Now, Han Su-Seol must take them in to his home.