Mr Duke (2000)

Jang Soo-jin is tricked into returning to South Korea by her father who wants an heir for his corporation. At the same time, Kim Yong-nam, a water bottle delivery man assumes a large debt to get some friends out of trouble. Jang Soo-jin and Kim Yong-nam end up using each other to try to solve their problems. Jang Soo-jin must pass off Kim Yong-nam as a Korean elite worthy of marriage, to get her father to back off. and so the story begins.