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.