Haeseong Ahn is 50 years old. He's 5'10", lean, and still very fit despite his age. He dyes his graying black hair, and has dark brown, almost black, eyes.

Conservative, proper, strict, and intolerant of failure, Haeseong runs his master's household with an iron fist. Typically has a chilling and imposing presence. Notoriously harsh, he's made multiple servants cry.

He's cold to his wife Eunsook and cruel, at times violent, with his children. There's only one person he's ever soft with.