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The story of a man who lost his loved one to the fault of a serial killer. In order to reveal the truth, he moves between two parallel worlds.

So Do Won is a fearless detective who becomes the leader of a violent crime investigation team at an early age. Mysteriously able to move between parallel worlds, Do Won now lives in both worlds as a man who must pay for the sins of his father, and a man who lives a hard life because of those sins in the other.

Also known as: 트레인 Teurein