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Military search troop members, including Koo Dong-Jin (Jang Dong-Yoon) and Son Ye-Rim (Krystal) try to fight against a mysterious creature and struggle to get away from the DMZ. They build camaraderie through their struggle. Koo Dong-Jin is a sergeant with only a little time left in the army. Son Ye-Rim is an elite officer and she has a secret about her birth.