He is a Korean-American successful billionaire, Alex Lee's younger brother, and Min Seol-ah's older adoptive brother who grew up with a bone narrow illness and a sense of justice. He was very close with his adopted sister and was extremely upset when his parents used her as his donor. He overheard the entire incident when Seol-ah was bullied by Hera Palace kids while he was on the phone with her, and is determined to punish them.