Giant wasps emerge on the school grounds and begin devouring everyone. Hanhui, Jongbin, Juhyeon, Ayeong, and Minji flee for their lives and take safe refuge inside a food storage room. Outside, however, all the others gradually transform into hybrids, one by one. Soon, a group of mysterious soldiers arrives, leaving them with syringes and weapons but offering no information. They now realize that no help is coming and that something larger is behind this insect apocalypse. Will Hanhui and her friends also turn into hybrids? Who are those soldiers? Against all odds, they must fight for their survival.