Eun-ah grabs Grandmother and threatens Eugene. Cheol-ung tries to stop her, but she snaps at him, saying, "The problem is you're too soft!" Meanwhile, Do-jun, merged with Edu the robot, helps Yeoreum by trying to trap Eun-ah in a net, but Eun-ah retaliates by summoning the school zombies to attack Yeoreum and Eugene. Cheol-ung then betrays Eun-ah and joins the side of good. Do-jun, still merged with Edu, suggests using a zombie cure beam and asks the others to buy him some time. During the chaos, a zombie attacks Eugene, but Grandmother pushes her out of the way and gets bitten instead. Do-jun fires the cure beam, turning the school zombies back into humans. Eun-ah also returns to human form, but Yeoreum, Eugene, and Grandmother (who is currently transforming) do not change back. As Eugene despairs, crying out, "Why isn't Grandmother changing back?..", Edu suggests heading to the laboratory. What will you do?