Junim, Angmaga Doege Haejuseyo!

Moran Baek is a high school student who seems to be an ideal young woman, but she is actually a demon who was banished and forced to live in a human body for more than 5,000 years. After her exile ends, she finds she still cannot access her demonic abilities and becomes desperate to regain them. She eventually learns that performing good deeds temporarily restores her powers and begins seeking opportunities to do good in hopes of fully reclaiming her demonic nature.