High school may be tough, but Woo Hyun has a guardian angel looking over him — literally. Disguised as a naive high schooler, Lee Seul Bi descends from the heavens to protect Woo Hyun's life, but discovers she's got a thing or two to learn about life as a teenager, including the pains of falling in love. Can this cherubic guardian protect the apple of her eye and also manage to survive high school?

• Kim Sae-ron
• Nam Woo-hyun
• Lee Sung-yeol
• Kim Min-seok
• Baek Seung-Heon
• Han Soo-yeon
• Jo Yeon-woo