Cheon Yeon-soo is a beautiful, hot-headed college girl whose family became millionaires overnight. She was raised by an over-indulgent father and grew up spoiled. Yeon-soo is used to getting any man she wants, but she falls in love with her polar opposite: awkward and polite Lee Jeong-do. Jeong-do is the only grandson of a very traditional family, and Yeon-soo attempts to transform herself into a proper lady so that her future in-laws will accept her. Little does she know that Jeong-do's family actually heads a notorious mob.