Park Dae-Seo (Jung Joon-Ho), the CEO of a tech startup, wakes up one morning and a finds a naked woman sleeping next to him in his bed. The woman's name is Jang Jin-Kyung (Kim Jung-Eun). Jang Jin-Kyung isn't your average young woman either. Her father is legendary crime boss Triple J (Park Keun-Hyeong). Meanwhile, Park Dae-Seo soon encounters Jang Jin-Kyung's three brothers who demand that Park Dae-Seo marry their sister.