Who is Kim Tan in the upcoming "Heirs" drama? An heir to the Jeguk (Empire) Group. He is overshadowed by his older half-brother, Kim Won, and is actually the son of his father's mistress, although he is listed in the family registry as the son of the second wife in order to be a legitimate heir. Prior to the show, he was exiled to study abroad in the U.S. before returning to South Korea. Although he is engaged to Yoo Rachel, he falls in love with Cha Eun-sang despite her poor background. The plausible reason for his exile to America, may have something to do with what happened in middle school. Tan confessed to Eun Sang that the hierarchy and the bullying all started with him and Choi Young Do back in middle school. Despite the fact Won, his older brother, hates him, Tan still cares about Won.