한은성

Eun-Seong's father is a police officer and mother is a housewife. She has a older brother.

She excelled at singing since young and taught herself how to play the guitar back in middle school. Also has talent in song writing. However she only writes songs as a hobby and has no plans to pursue it as a future career.

Best matching her test scores, she choice to study English Literature at Y University. However while taking up a sudden undercover investigation, she dresses up as a man and attend the School of Mechanical Engineering at Y University as well.