Gigantic wasps appear on school grounds and start devouring everyone. Hanhui, Jongbin, Juhyeon, Ayeong, and Minji, run for their lives and safely hide inside food storage. Outside, however, all others turn into hybrids, one by one. Soon, a group of mysterious soldiers shows up and leaves them with syringes and weapons but no information. Now they realize that no help is coming and that there's something bigger behind this bug apocalypse. Will Hanhui and her friends also turn into hybrids? Who are those soldiers? Against all odds, they must fight for their survival.