Ahn Kyeong-hyun is a romanceless boy who loves to study, and his greatest reward in life is obtaining perfect grades in school. If he had one wish, it would be to study from sunrise to sunset forever. But one day, when he gets into a car accident and wakes up in a hospital with an amnesia, he is confronted by three girls claiming that they're his girlfriends: Yu Yuyu, his classmate; Han Ka-ryeon, his junior at his part-time job; and Ahn Yeon-hee, his younger sister.

Are they really telling the truth? A chaotic, mysterious, harem comedy of love and lies!