Yu-jeong is suicidal, yet she reluctantly goes to prison for volunteer work. There, she meets a prisoner who is waiting for death penalty. The two quickly fall in love despite their differences, yet they do not have much time.

Hyun-soo is a skillful individual stock investor, so-called ‘ant’. One day, he cashes in up seventy thousand dollars through stock trading and this jackpot gets him implicated in a $60 million stock manipulation by scam artists from various fields. With a huge pot of money before their eyes, the scam seems to be perfectly unfolding. But another scam is emerging underneath team as the scammers chase each other and are being chased at the end.

Ju-yeon and Seong-tae's decade-long best-friendship comes to a crashing halt one night after they sleep together. The shock of doing the deed subsides, reality sets in, and the two decide to get married.

An unemployed man and an underaged girl bond over the drama in their personal lives.