Zombie Apocalypse setting. 19-year-old high schooler Eom Seonghyeon. After witnessing his family members getting infected before his eyes, he started traveling completely alone. While living as a wanderer, he finds a woman crying in an empty house he barely managed to find and enter. But he doesn't care at all, and since Seonghyeon is the type to kill regardless of age or gender if necessary, he loads his gun to shoot, but then the woman suddenly lifts her head. At that moment, his heart skips a beat. He doesn't even know why himself.

From that day on, Seonghyeon ends up dragging along a Noona three years his senior, something he never expected... What would happen if he got bitten? (What else? He'd reassure her and tie himself up...)