One day, a stationery store in front of an elementary school is struck by a lightning and a mysterious thing happens.

A clumsy high-school girl - Oh Ha-ni - is at the bottom of her class, and she has had a crush on a popular genius, Baek Seung-Jo, ever since she first laid eyes on him.

Desperate to discover who framed him for murder, criminal Su-hyun escapes from police custody and crosses path with cop Sung-woo. After realizing they have a mutual enemy, the two form an unlikely alliance and together go looking for payback.