Kang Jae is a wealthy businessman and gangster and Mi Joo is a plastic surgeon. These two meet after Mi Joo mistakes Kang Jae as being her sleazy brother-in-law. Kang Jae just happens to be the boyfriend of Mi Joo's pregnant neighbour, Yoo Jin. Sae Yeon meets Mi Joo and falls in love with her feisty attitude. Kang Jae works for the father of Sae Yeon who is a gangster. Mi Joo and Kang Jae fall in love.
Yoon Mi-ju (Kim Jung-eun) is the daughter of a reverend, who has adopted many children and set up an orphanage. She works as a plastic surgeon in a hospital, although her dream is to open a clinic of her own. Ha Kang-jae (Lee Seo-jin) is an orphan raised by Kang Choong-shik, a gangland boss, and his trusty right hand. The two meet when Mi-ju mistakes Kang-jae for her adoptive sister's former boyfriend, who dumped her after discovering she was pregnant; as Mi-ju learns a little later, Kang-jae is actually in a relationship with Park Yu-jin (Kim Gyu-ri), Mi-ju's neighbor.
When Kang-jae is wounded by some Chinese gangsters, Mi-ju treats him and he begins to fall for her; meanwhile, Kang Se-yeon (Jung Chan), son of the boss Kang-jae works for, falls in love with Mi-ju, who his mother wants as a daughter in law because she considers her a good catch.