Detective Park Jung-woo receives a top-secret mission to infiltrate a drug organization smuggling new narcotics from Southeast Asia. With a fake identity and criminal record, he works his way up from the bottom over three years to become the boss's right hand. He forms a genuine brotherhood with second-in-command Tae-sung and falls in love with Tae-sung's sister. As he gains the organization's trust, his identity as a cop wavers. When another spy is exposed within the organization, suspicion falls on Jung-woo. Torn between loyalty and duty, his choice between two worlds will change everything.
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