Jo In-sung
Jung Jae-min (Jo In-sung) is the youngest son of the wealthy chairman of the Pax Group. He is uninterested in business, irresponsible, arrogant, childish, self-centered, and a playboy. Jae-min is constantly put down by his elder brother and beaten up by his father, but he is immune to all these treatments. He is engaged to Choi Young-joo (Park Ye-jin), who comes from a comparably wealthy and powerful family, but Jae-min and Young-joo are not in love with each other. Jae-min is of the opinion that even with marriage, it should not affect how both of them are to lead their lives.