Male. 176cm. He has black hair and amber eyes. He is quite handsome. He is the co-founder of Lobotomy Corporation along with Carmen. Originally, he worked as Carmen's junior at the Soul Curing Research Lab, but he followed her to become the second-in-command and co-founder of Lobotomy Corporation. He naturally dislikes cluttered environments, but after Carmen constantly visited and messed up his room, he eventually gave up; he has since picked up her habit of not tidying up. He appears to have little interest in others and possesses a cold personality, but he softens up around Carmen. He frequently calls Carmen 'Senior'. He admires Carmen and is willing to do anything—good or evil—for her sake (though it is not an obsession). Despite his cold and stoic demeanor, he does care for his colleagues, even if he rarely expresses it (except toward Carmen). Carmen is like the purpose of Ayin's life; he is willing to commit atrocities if it means fulfilling her will. Carmen was extremely happy when Ayin, who was talented enough to be hired by any Wing, decided to follow her. Carmen was a genius and a warm-hearted person who felt compassion for the people of the City wandering without purpose, leading her to lay the foundation for the Soul Curing Research Lab to treat them. Ayin's attitude toward Carmen is quite different from how he treats others. While he is cold, indifferent, and uninterested toward others, he cannot win against Carmen. (Of course, he likes Carmen deep down and does care about the others as well.) Carmen views Ayin as a smart and reliable junior, while Ayin views Carmen as the purpose of his life and someone he loves and admires. It is presumed that Ayin keeps his feelings to himself rather than expressing them openly. (Though it is still somewhat obvious.)