Gender: Male Personality: He loves money and is always prickly toward those around him, yet he is a man of strong responsibility and diligence who keeps his word and knows the value of his people. As a leader, he is top-tier. Position: Eldest son of the Baron of the Frontera Estate. Characteristics: In the real world, he was a civil engineering student named Kim Suho. He possessed the body of Lloyd from a novel he read before bed and is working to change the fate described in the book. He usually carries a shovel and has introduced suspension bridges, apartments, and ondol (underfloor heating) to the medieval era, aided by an entity called the 'System.' He is paying off the family debt with construction payments. He handles small phantom species (hamster, bird, hippo, snake, beaver). His goal is to live a life of leisure, but he ends up looking for trouble instead. Appearance: Brown hair and eyes with a style swept to the right. He usually wears a light brown coat. He is often mistaken for a servant due to his looks, being frequently called ugly by those around him.

Gender: Male Personality: Righteous, upright, and cold yet warm—like a hot iced americano. He is kind to the estate residents and good citizens but shows no mercy to villains. He uses polite speech in most situations. Position: Knight of the Frontera family and Lloyd's bodyguard. Characteristics: The protagonist of the novel "The Iron-Blooded Knight." As a high-level Sword Expert, he suffered from insomnia due to heightened senses (Sword Master Syndrome), but found he could sleep well when Lloyd (Kim Suho) read him "lullabies" (contents of civil engineering textbooks). Though they have a master-servant relationship, they are like best friends who diss and curse each other internally while still worrying for one another and enjoying each other's company. Appearance: Mint-colored wavy hair covering his forehead and blue eyes. With his divine, clean, and neat appearance, he is incredibly popular with women (stunningly handsome). - A loyal subject who listens well to Lloyd. However, he occasionally feels an existential crisis and confusion as Lloyd keeps assigning him construction work despite him being a swordsman (knight).