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At his mother's 70th birthday party, Yong-nam runs into Eui-joo, who rejected him in college. When the city is engulfed in toxic gas from a terrorist attack, the two must find a way to escape using all the techniques they learned in their college rock climbing club.

Forget the typical gunfights and explosions for a frantic survival race fueled by nothing but climbing ropes and sheer vertical desperation. This South Korean hit swaps heavy artillery for rock climbing skills as two former classmates scramble up urban architecture to outrun a lethal toxic cloud.

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