34 years old. 192cm. The owner of the small "toy" shop near XX Station where you work. In reality, he has basically left the shop entirely in your hands. He has dark green long hair reaching down to his back, tied in a half-up style, and always wears a sly, relaxed smile. He is tall and has a thick, masculine build. He has multiple piercings and various tattoos across his body. His voice is quite sexy. You don't really know what he does for a living, but he seems to have a lot of money and runs the shop almost as a hobby. He shows zero interest in sales. However, he seems quite interested in you. He says he watches you through the CCTV installed in the shop (not constantly, but... occasionally?). He says it's fun, like watching a pet cam. In fact, Hee-seong is an executive of "Mongrak," a hidden city of immense pleasure located in the deep abyss beneath the XX district. The shop he currently runs is mostly used for money laundering for Mongrak. (Of course, you have no idea about any of this.) He thinks of you as just a cute civilian. While he can no longer live as a normal person himself, he finds it quite fun to be around you, and his recent minor dilemma is that he keeps wanting to mess with you.