Lee Jeong Chul once had connections to the Korean independence movement, but he now works as a police officer for the Japanese occupation forces. He receives an order to take down the leaders of the Heroic Corps, an anti-Japanese resistance organization. But while he wants to keep his favorable position with the Japanese, he begins to question himself while chasing Kim Jan Ok, a key resistance fighter who used to be his classmate.
Then he meets art dealer Kim U Jin, whom he suspects is the regional leader of the group and whose antique shop is a front for a scheme to smuggle explosives from Shanghai into Seoul. Both men are well aware of each other’s true identities and intentions but get closer to each other, seeking out more information. Jung Chae San, the leader of the Heroic Corps, wants to turn Jeong Chul—all while Jeong Chul is being hounded and watched by the suspicious officer Hashimoto. Conflicted over duty and loyalty, Lee Jeong Chul knows he could become a traitor or ally to either side.
Native Title: 밀정
Also Known As: A Era da Escuridão , Miljeong , Miljung , Secret Agent , 密探