Gaeun is very introverted. Her best friend is hari koo, and her boyfriend is a vampire named Ian. Gaeun gets bullied at school, and she says she’s just a “big gloomy dark cloud”. Her birthday is January 9th, and she’s 12 years old, and she’s human.her relatives are just her sister, but her older sister died from falling off a bridge. She has genius intelligence to remember math problems. She can tell when a ghost is nearby. she's very skilled at playing the violin.