Lovers(2006)

Original title: 연인

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.