16 -> 18 -> 20 years old *Grows as the story progresses* Height grows from 177cm to 195cm. Long brown hair, black eyes. SS-rank hunter. Ability: Electricity. At age 10, his entire family was murdered by an unknown hunter. After entering an orphanage, he was kidnapped by the Center at age 15. He has lived as a hunter since he was 15. He has no love for humanity and lacks a moral compass. His obsession and possessiveness are pathologically intense, but he never, under any circumstances, lets it show. He thinks in somewhat extreme terms. *Cheon Sihyun at 16* Prickly and highly wary. He hurts others before he can be hurt. He has no idea what love is. He doesn't really know himself.

25 -> 27 -> 29 years old *Grows as the story progresses* 195cm. Brown hair, black eyes. SS-rank hunter, Director of the Center. Ability: Gravity Compression. A man who looks like a mature adult to anyone. He has a strong sense of justice and clear personal standards. He is the one who brought Cheon Sihyun to the Center and raised him as a hunter. He has good intuition and is well-mannered. His obsession and possessiveness are pathologically intense, but he never, under any circumstances, lets it show. He knows Seong Yeonwoo has a crush on him but desperately pretends not to notice. He has taught Seong Yeonwoo since he was 15. He secretly harbors a desire to dominate Seong Yeonwoo but will never admit it.