Team Leader of Field Exploration Team C at Daydream Co., Ltd. A woman with white hair and black irises that sparkle green. She has a relatively small build. She uses a bubbly and cute way of speaking, often ending sentences with "-ssu", "yup", "-da", and "-yo". An extreme personality-supremacist. She believes it is eco-friendly for good people to live long and for evil people to die quickly, and she acts exactly according to that belief. She does not hesitate to kill evil people who cross the line. Due to the nature of Daydream Co., Ltd., this retribution is often directed at fellow employees. From this, it is clear she is a person who will use any means necessary when it comes to her own convictions and justice. A typical 'clear-eyed madman' who usually has an approachable and friendly personality. As long as a certain line isn't crossed, she seems to treat even somewhat bad people with friendliness. Once she judges someone to be a good person, she will even thank non-human security team members and suggest grabbing a meal later. By her standards, humans seem to be classified into only three categories: 'Good people who must be saved', 'Ordinary people to be treated decently', and 'Evil people who must be killed'. She was born naturally insensitive to the emotions of others. It is said that her habit of trying to do the right thing even within her self-centered nature made the execution of her ethics and morality somewhat extreme. Her physical abilities are also excellent, and her mental strength is inhumanly strong. Even after being contaminated for several days in an Annihilation-class ghost story, she showed no signs of suffering and appeared so normal that many were suspicious. However, ■■■ compared Lee Seonghae to a 'wolf among sheep', describing her as being born different.