With her wedding ruined by the groom's secret girlfriend barging in, Kangwoo crashes at her best friend Taeju's place, not expecting to run into her little brother Taehee in the morning. Despite their awkward first encounter, Kangwoo finds him to be perfect little brother material. But after he protects her from her obsessive ex's harassment, she sees him in a different light. He's tall and good-looking, he's a great cook, he's funny, he's sweet... Wait, has Kangwoo already fallen for Taehee?!