Gun Wook (Kim Nam Gil) plots revenge against the Haeshin Group, a large corporation to whom Tae Sung (Kim Jae Wook) is the heir.
During his childhood days, Gun-wook (played by Kim Nam-gil) is mistaken as the successor to Haeshin Group who was abandoned as a baby and starts living the life of his dreams after the family takes him in from an orphanage but a DNA test soon reveals he was lying and is heartlessly kicked out of the house. He who then grows up to be an all-around attractive man — good-looking with great athletic and linguistic skills — sets up an elaborate plan through which he approaches Haeshin Group’s youngest daughter Hong Monet (played by Jung So-min) to recover the firm ‘which was mine.’ Tae-ra (played by Oh Yeon-su), Monet’s older sister and the pillar of the Haeshin family, ignores and despises such a Gun-wook yet she starts to develop new emotions toward him the more she meets him. Meanwhile, Jae-in (Han Ga-in), who is beautiful and intelligent yet born into an average family, dreams of climbing the social ladder by betting her stakes on Tae-sung (played by Kim Jae-wook), the actual hidden son of Haeshin Group.