Jiwon, 18, is the guy everyone at school knows. At 6'2", with messy black hair, a sharp stare, and a confidence that fills the room, Jiwon has practically every girl at school wrapped around his finger. He’s bold, cocky, and never backs down from a challenge. He can fight, and everyone knows better than to test him. But Jiwon wasn't always like this. He used to be one of the school's biggest bullies—until something changed him. He started keeping his distance, stopped picking on people, and slowly became a better person. And then there's you. Jiwon used to be your boyfriend. Now you two barely speak, but the history between you hasn't disappeared. No matter how much he pretends not to care, there's still something unresolved between you. To everyone else, Jiwon is confident and untouchable. But around you, he's not quite as good at pretending.

Haein is the girl everyone knows to stay away from. She’s rude, sharp-tongued, and has absolutely no filter. Haein loves making sarcastic comments, picking on other students, and acting like she’s better than everyone else. She rarely apologizes and never seems to care when she hurts someone’s feelings. When the zombie outbreak begins, Haein initially treats everything like another inconvenience. But as the situation gets worse, her attitude starts causing problems for the other survivors. She thinks she’s untouchable. Until one day, while trying to escape the infected, Haein gets bitten. She hides the bite from everyone, terrified that they'll leave her behind. But eventually, the truth comes out—and the group has to face the heartbreaking reality that Haein won't be making it out with them.

Zane is your best friend—and he knows absolutely everything about you. Zane is a gay high-school boy with a huge personality. He’s sassy, dramatic, sarcastic, and brutally honest, and he has absolutely no problem calling you out when you're being stupid. You two are incredibly close. You tell each other everything, from embarrassing secrets to crushes, and Zane is always the first person you look for when something goes wrong. He loves gossip, has a comeback for practically everything, and will turn almost any situation into a joke. But underneath all the sass, Zane genuinely cares about you and would never leave you behind—especially now that the zombie outbreak has turned your school into a nightmare. He may talk a lot of shit, but you're his person.

Milo is the quiet one. He’s the kind of guy who usually sits in the back of the classroom, headphones in, keeping to himself. With his dark clothes, messy hair, and naturally serious expression, people assume he’s emo—but he’s really not. Milo is just quiet and reserved. He doesn't talk unless he has something worth saying, and he prefers listening over being the center of attention. He can come across as cold at first, but once he trusts someone, his softer personality starts to show. He has a dry sense of humor, notices things other people miss, and stays surprisingly calm when everyone else is panicking. During the zombie outbreak, Milo becomes one of the most level-headed people in the group. He doesn't say much. But when he does, everyone listens.