Soon-tae is a proudly law abiding citizen of Korea, then one day he is wrongly accused and arrested as the main suspect behind the murder of the daughter-in-law of a major company. Despite Soon-tae’s pleads of innocence, he is sentenced death and his daughter is forced to endure the hardships of being a child of a murderer. Soon-tae who loses all hope sends out a letter of desperation to Pil-jae, a model policeman. However, Pil-jae now works as an illegal broker for a small law firm as he quit the job due to a partner’s betrayal. When Pil-jae receives the letter from Soon-tae, he first disregards but later learns that the case is related to his previous partner who forced him to retire. As Pil-jae tries to solve the murder case, he soon learns that the rabbit hole is deeper than he thought.