Decades ago, after the mutant crisis occurred, South Korea’s administrative regions were divided into the Black Zone and the White Zone.

Hong Jiyeon, who grew up like a greenhouse flower in the mutant-free White Zone, is an ordinary office worker.

Just when he becomes exhausted by Manager Park’s nagging and unending overtime, Jiyeon is attacked by Park, who has mutated.

He narrowly escapes danger with the help of Yoon Suhyeong, the sales team leader, but he has always found Suhyeong difficult to deal with.

Despite not even being on the same team, Suhyeong kept trying to set up weekend workouts, early-morning soccer, hiking, and other plans that were hard to refuse, every golden weekend.

On top of that, this man is suspiciously skilled at disposing of mutant corpses.

After Manager Park’s death, the people who filled Jiyeon’s everyday life begin mutating one by one, plunging the entire city into chaos…

Will Jiyeon be able to escape the mutant-infested city safely with Suhyeong?

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