Kim Seol is the candidate to become North Korea’s next leader and its very own “Princess.” However, Seol lives as an ordinary South Korean high school student, completely unaware that she is the daughter of Kim Jeong-un. To protect her daily life, the youngest-ever “Black Agent,” Jeong Su-hyeon, has infiltrated into her high school. A School Romance Comedy that unfolds as a secret agent meets an oblivious princess!