Jo Jung-suk plays Yong-nam, a former college rock climbing star who's struggled to find success after graduation. He relies on his parents for financial support and is determined to make his mother's 70th birthday special by hosting the party at Dream Garden, where his old crush Im Yoon-ah works. However, their celebration is disrupted by a mysterious white gas that engulfs the city, and Yong-nam must use his rock climbing skills to help Eui-ju and others escape the danger.

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A climber with exceptional abilities embarks on a perilous mission to rescue the citizens of Seoul, who are trapped in a city suffocating under a thick, deadly white gas.