In the world of high-stakes celebrity protection, a former special investigator turned bodyguard named Kim Seol-woo (Park Hae-jin) is hired by a temperamental Hallyu star, Yeo Woon-gwang (Park Sung-woong), to protect him from the threats that come with fame. But what Woon-gwang doesn't know is that Seol-woo has his own agenda: he's actually a black ops agent working for NIS (National Intelligence Service) on a top-secret mission. As the two men spend more time together, they develop a strong bond and share many adventures along the way, but their relationship is put to the test when Seol-woo's true identity and purpose are revealed. Will their friendship survive?

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Some TV shows that have similar genres and were produced around the same time as Man to Man include 3 Body Problem, Shōgun, Fallout, Renegade Nell, Star Trek: Discovery, The Last of Us.