In a world where guardian angels are tasked with protecting and guiding humans, Keeho is an enthusiastic, charming guardian whose mission is to inspire his assigned human, Soul. Soul is a shy, introverted teenager who feels invisible and struggles with self-doubt. As Keeho helps Soul navigate his challenges, their bond deepens, leading Keeho to break the fundamental rule of the celestial realm: angels cannot fall in love with their assigned person.