Lee Min-ho as Kim Tan
Jung Chan-woo as young Kim Tan (middle school student)
He is the future heir to the Jeguk (meaning “Empire”) Group.[16] Though hot-headed and at times immature, Kim Tan is warm-hearted and honest. He does not have a good relationship with his father and half-brother, the latter from whom he constantly seeks friendship (but who doesn’t gives him any). He is actually the son of his father’s mistress, but is listed in the family registry as the son of his father’s second wife in order to be a legitimate heir. Prior to returning to Korea, he was exiled by his brother to study abroad in the U.S. Although he is engaged to Rachel Yoo, he is attracted to Cha Eun-sang at first sight and falls in love with her despite her poor background.[17]
Park Shin-hye as Cha Eun-sang
Down-to-earth and somewhat cynical, she diligently works part-time jobs to support herself and her mother, and gets caught in a love triangle between Kim Tan and Choi Young-do.[22] She
