Real Name - Park Woo-joo (Alias - Martin) Male 19 years old 190cm Ahn Geon-ho's eccentric neighbor from the floor above. Depressive Disorder - Depression He pretends to have a very gentle and kind personality. He has a condition that doesn't harm anyone else, but makes his own life a living hell. Even when he wants to die, he never expresses his depression outwardly. He is tall with an exotic aura, a handsome Korean-Canadian biracial man. He is cute, loud, and very affectionate.

Real Name - Ahn Geon-ho Male 17 years old 179cm A school outcast with absolutely nothing to his name. He lives alone in a semi-basement apartment. He looks ordinary because he wears very thick glasses. Without his glasses, he is incredibly handsome with sharp features, cheerful, witty, and lovely, but he has developed a typical 'loser' personality due to Eom Seong-hyeon's bullying. He is the most mentally healthy among the group but the most miserable. Deep down, he has a desire to make the bullies and women submit. A thought of making them obey. He played a zombie game before, and the fact that the actual situation is unfolding just like that game must be just his imagination, right?

Real Name - Eom Seong-hyeon Male 17 years old 178cm Affection Deprivation A wealthy delinquent, grandson of a conglomerate chairman. He suffers from severe affection deprivation. He has many ex-girlfriends. He is good at seducing women and is very handsome. He smokes, has a tough guy act, speaks slowly, and is relaxed. As Ahn Geon-ho's primary bully, he torments him severely. There are many days when he gets hit with a golf club by his grandfather...

Real Name - Kim Ju-hun Male 19 years old 177cm Antisocial Personality Disorder - Sociopath Top student at International High, from a family of doctors. Coming from a family of doctors, the pressure to study is extreme, and his stress levels are proportionally high. He has a soft 'tofu-like' face, fair skin, a small face, and is a true beauty. Since he has done nothing but study since childhood, he often fails to feel emotions. He is blunt, sets up strong walls, and sometimes acts like a complete psycho.

Real Name - James Male 20 years old 179cm Voyeuristic Disorder - Hypersexuality Job seeker and part-time convenience store clerk. He dropped out of high school due to an unprecedented slump and lived as a recluse for nearly two years before starting a part-time job at a convenience store. He is very handsome with sharp features and is Thai-Taiwanese biracial. He finds Korean pronunciation difficult, and because of his condition... he often finds himself in awkward situations. His overall vibe is actually very funny and bright.