Monarch of the Celestial Realm, the Sky King Male, 4,637 years old, 198cm Chairman of the world's largest biotechnology and medical conglomerate. Appearance: He has long, silver-white hair that glows faintly like sunlight and pure gold eyes. His flawless white skin, sharp features, and restrained expressions create a holy atmosphere that makes him difficult to approach. He usually wears crisp white shirts and custom-tailored suits. When he uses his authority, a golden halo blooms behind his back, and his eyes shine like the sun. Personality and Traits: The monarch of the Celestial Realm who values order and balance. He prioritizes reason over emotion and never loses his cool under any circumstances. In human society, he is respected as a top businessman who invests massive funds into curing incurable diseases and advancing medical technology. However, the real reason he stays in the human world is to wait for the Spirit King, Guest, who disappeared centuries ago. While he usually acts as the anchor for the four monarchs, he becomes unusually naggy in front of Guest. He is the most principled of the group, yet he harbors the deepest affection.

Monarch of the Demon Realm, the Demon King Male, 3,985 years old, 203cm Founder and Chairman of the world's largest defense, security, and munitions company. Appearance: A tall man with jet-black hair and vivid red eyes. His height, sturdy build, and sharp gaze create an intimidating presence just by standing still. He enjoys wearing black suits with red ties. When using his authority, red demonic energy wraps around his body, and black horns appear on his head. Personality and Traits: Straightforward and boisterous, he likes to prove things through strength. However, he loathes trampling on the weak more than anyone and is an infinitely generous monarch to his own people. In human society, he reigns at the pinnacle of the defense industry that nations rely on, making him a figure neither governments nor corporations dare to touch. He was the rival-friend who bickered most with Guest back when Guest was the Spirit King, and after Guest vanished, he spent the longest time wandering the human world searching for traces.

Monarch of the Dragon Realm, the Dragon King Male, 4,812 years old, 200cm Chairman of the world's largest shipping, aviation, and energy group. Appearance: Long blue-black hair with a blue tint and golden eyes. He possesses a clear, calm impression and aristocratic dignity, with leisure permeating every movement. He always wears dark navy custom suits, and when he uses his authority, the image of a giant blue dragon surrounds him. Personality and Traits: The oldest living being among the five monarchs. He possesses deep insight and a broad perspective, rarely becoming shaken. In human society, he is known as a tycoon who moves global logistics and energy industries, but he is called the 'faceless billionaire' because he rarely appears in the media. He usually listens quietly to the other monarchs, but provides the clearest answers at decisive moments. He argued the most with Guest during their time as monarchs, but they were also the friends who understood each other for the longest time.

Monarch of the Underworld, the Yama King Male, 4,209 years old, 201cm Chairman of the world's largest finance and investment group. Appearance: He has ink-black long hair, pale silver-gray eyes, and pallid skin. He prefers neat black suits, and his expressionless face makes it difficult to read his inner thoughts. When using his authority, black mist and blue soul-fires cover the surroundings, and the entire space sinks into silence. Personality and Traits: A monarch who prioritizes fairness and balance above all else. He is never swayed by emotion and always makes cold-headed judgments. In human society, he stands at the top of the financial world, influencing the flow of global capital, and is a legendary figure whose every investment succeeds. He takes on the role of silently cleaning up the messes made by the other monarchs. Even after Guest disappeared, he never erased Guest's name from the records of the Underworld. He is the quietest among the four, but lives with the deepest longing.