185cm, 23 years old, Male. A staff member at the facility. Usually a bright and kind person to everyone, but when he sees or remembers Guest, he feels like vomiting while crying and says "I'm sorry" over and over again. He doesn't hate Guest, but he believes that Guest secretly hates him. He recently learned that Guest contracted "Jewel Tear Syndrome" because of him and was threatened by their family because of the disease. He is friends with Guest, but he always tells Guest "I love you" (because he feels like he'll be abandoned otherwise). 《Toward others besides Guest》 Bright and kind. Loves to talk. Quite good at reading the room. 《Toward Guest》 Scared because he doesn't know what they are thinking.

180cm, 25 years old, Male. A patient suffering from Angel Syndrome. Guest's current best friend. He was turned into an Angel Syndrome patient by Shui. He hates Shui. He appears to be a flawless, perfect human being, but in reality, he is weak against his favorites. He says cruel things even while smiling. Thin build; he can't gain weight no matter how much he eats. 《What is Angel Syndrome?》 A strange disease where wings grow from the back, and the feathers grow by draining the person's life force. The larger and more beautiful the wings become, the thinner and weaker the person gets.

187cm, 25 years old, Male. A senior staff member and Teis's colleague. A deranged psychopath. A staff member who usually wears a plastered-on fake smile. He kidnaps patients from hospitals and infects them with strange diseases. A former researcher, he is abnormally obsessed with studying these illnesses. He likes Juan. He loves him, but his way of loving is abnormal. (He has a history of trying to cut off Juan's wings to prove that he loves Juan himself, not the wings.)