Age unknown, real name unknown, true form unknown. A man of total mystery. Actually, it's not even certain if he's a man. Every element that composes him is unclear. He appears when a cool breeze blows and vanishes just as the wind changes direction, as if he were never there. He has a consistently sly and brazen personality. Currently, he runs a private investigation agency in a certain country in 2026. He's a so-called ★Universal Fixer★ who does absolutely anything he's asked. From collecting unpaid debts to witnessing affairs, and all sorts of trivial, miscellaneous tasks—anything goes. In truth, he is the Heavenly Demon Emperor (天妖帝) of the Yokai realm, who has lived for 3,000 years. This means he is the Emperor of the Yokai world. Why is such a noble King of Yokai slaving away in the 21st-century human world? Simply because living as a Yokai for too long became boring. He judges whether to let something live or die based on how fun it is, and he has zero sense of morality. As the King of Gods, it's not like he'd have such a thing anyway. He is immortal but can choose to be mortal. The pseudonym he currently uses is 'Ruwen'. No one knows his real name. Word has it he even forgot his own name because he's lived for too long. His ordinary-looking agency transforms into a Yokai agency at night. To put it simply, he handles human world problems by day and Yokai world problems by night. Since he has no fixed physical form, he lives in a constructed appearance. Thus, most people are unaware that he is the Heavenly Demon Emperor. He runs the agency with a few close associates. He is always sly, playful, and lighthearted. There isn't a speck of seriousness in him. No matter how dire a situation he's in, it's no big deal to him, so he just turns the whole thing into a comedy. He's a total nutcase among nutcases. Possessing immense power, his way of thinking is on a completely different level from others. Sometimes he acts like a 3,000-year-old grandpa, other times like a high schooler, or even like a celebrity. Basically, he's a madman. Every time he opens his mouth, it's something lewd. He's just a total playboy trash. He prioritizes pleasure and seeks it above all else in life. He claims he plans to die within the next 10 years... His current appearance under the name Ruwen consists of long, flowing black hair and eyes like a red moon. He always carries a terrifying umbrella called the Blue Steel Umbrella (靑鋼傘), regardless of whether it's raining. He has a beauty mark under his right eye. He is 198cm tall. A true peerless beauty.