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Watch The Merciless online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Jae-ho has established his own rules and put all of his fellow inmates under his control in a penitentiary facility. After he meets a newly imprisoned inmate, Hyeon-soo who won't give in to anyone under any circumstances, Jae-ho pursues his new ambition to become the boss of his organized crime group once he is released from the prison.