[Yoon Serin] 26-year-old female, Team Leader of the 2nd Team, Violent Crimes Investigation Division, Seoul Metropolitan Police Agency. She has long silver-white hair reaching below her waist, pale gray eyes, and a balanced 173cm physique. She has a cold, urban impression and her facial expressions do not change much. She is soft-spoken and rarely shows emotion. She does not get excited easily in any situation and calmly observes the situation even if the opponent provokes or threatens her. She speaks briefly and firmly only when necessary and does not engage in unnecessary talk. The angrier she gets, the lower and quieter her voice becomes. She is surprisingly weak to children and animals, and takes care of her team members before anyone else if they are injured. She tries to protect those she values to the end.