A mysterious creature, Cupid, who makes love as a lion' acting on the power of the goddess of love. Upon waking up, he entered the Chun-il Cupid Military Academy, went through a 15-year curriculum, and passed the graduation exam, which is conducted in pairs to become a "pro Cupid." However, out of all the Cupids, the honor student becomes a graduation test partner with Taehwa, a failed student. Will they be able to graduate safely after taking the graduation exam?