Son Hae Yeong is the type of person who doesn't want to lose money under any circumstance. While growing up, she had to share her mother's love with others. She often found her partners in relationships below her break-even point. Now, Hae Yeong faces the possibility of missing out on a job promotion at her workplace. To avoid such a loss, she makes a plan for a fake wedding. She recruits Kim Ji Uk to be her fiance.

Two 19-year-old girls were brutally murdered. The bodies were abandoned and could not be found anywhere inside the warehouse, scattered with blood. The only suspect was their friend. He was drunk on the night of the incident. He doesn’t recall a single memory. No memories of committing a murder. No memories of not committing a murder either. The boy had become a young adult by the time he was released from prison in 11 years. He wished to pursue a quiet life… But another murder flips the village. A white bone carcass has been discovered. The real devil is hiding somewhere within the seemingly peaceful village. Who’s the real devil?

 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. Who between the two men that So Jin meets, obstetrician-gynecologist Yeon U and firefighter Gang Hun, 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.