"Narco-Saints" is a South Korean series based on true events. Kang In Gu is an ordinary middle-level businessman who is not affiliated with any special services and has no military training. However, by twist of fate, he finds himself in the midst of a dangerous criminal battle between the police and drug traffickers. With no other choice, he joins a secret operation of the National Intelligence Service to capture the drug lord, Jung E Hwan, who has been hunted by the police for years.