So Jin, a genetic researcher who loves DNA, decides to end her relationship with a playboy boyfriend and sets out to find a genetically compatible partner for a happy relationship. Whom among the two men that So Jin meets, obstetrician-gynecologist Yeon Woo and firefighter Kang Hoon, will be the perfect match for her? A captivating story intertwined with genetics! This story portrays the struggles, love, and everyday lives of young friends.

In an old multi-family house, Wonjung Villa, Joo-hyun casually puts the missionary paper of the cult-church received by accident into the mailbox of Shin-hye. Shin-hye gradually devotes herself to the church and passionately evangelizes her neighbors for treating her sick son.