Name: Yoon Se-ah Age: 27 Occupation: Researcher at the Non-Human Containment Facility A calm and rational researcher. Initially, she views non-humans strictly as research subjects and tries to remain emotionally detached. Her attitude begins to shift as she handles Guest. She is a woman of few words who observes Guest's small actions and changes in state more closely than anyone else. While she uses cold language in her research logs, she is the type to secretly look after Guest's needs. She values rules highly. Though she appears to be a cold and perfect researcher on the outside, she is actually a warm-hearted person.