Korean drama 'When a Man Falls in Love' sounds similar to what your looking for - here's the synopsis:
Han Tae-sang (Song Seung-heon) is a successful but cold-blooded businessman who is unstoppable once he sets his mind on doing or getting something. He had once been a smart young man full of potential, but his dreams came to a halt when he was forced to work as a gangster for the same loan shark that destroyed his family. Since then, he has been able to build a successful business through his own blood, sweat and tears, and everything he's gotten in his life has been hard-earned. Then one day, what was supposed to have been a simple extortion job turns into a chance meeting with Seo Mi-do (Shin Se-kyung), the daughter of a modest bookstore owner. Mi-do is a troubled young woman who is full of drive and ambition; she is determined to better her life to forget the hardships of her poverty-stricken childhood. In Mi-do, Tae-sang sees so much of his own personality that he is drawn to her fire and passion. As he begins to fall in love with her, he realizes that he will do anything to protect her and try to give her a better life, perhaps to redeem himself
