Tae-joon is a high-flying insurance fraud investigator known as the ‘Grim Reaper’ who con artists fear the most. Then one day, he quits his successful job for the sake of his son who is suffering from leukemia. With only three months left to live, the doctor informs Tae-joon about a new drug in development that may save his son. Since the drug isn’t available yet, Tae-joon forms a team of thieves and grifters he once captured to retrieve the drug. But his planned heist fails and it turns out he was set up. Tae-joon is ultimately cornered and doesn’t make it in time to save his son. After his world is turned upside down, Tae-joon decides to fight injustice and swindle money out of the corrupt and wealthy —while avenging his son’s death.