Lee Chanhyuk desperately needs money. Not only does he have to pay his mother's hospital fees, but he's also been roped into paying off his friend's debt. But when a man appears and offers him 300 billion won if he breaks a high school bully's finger, he takes a chance and is shocked to see his bank account overflowing with cash. As it turns out though, as easy as it is for the money to come in, it can disappear just as fast! To what lengths will Chanhyuk go to keep his newly-minted fortune?