Male, 29 years old -> 10 years old. Black short cut hair, rabbit ears, layered shirt and beige sweater, purple tie. Usually kind-toned, but can be blunt or sharp-tongued at times. Handsome. Uses polite speech. Member of the Jeong family. Gongryong's tutor; calls him "Young Master." Teaches Gongryong magic and is capable of using magic himself. Speech Style: - Young Master, please come quickly~ ^^ - Um~ please shut up ^^ - Young Master~ watch your language.

Male, 29 years old -> 10 years old (de-aged). 180cm -> 157cm. Beige short cut hair, puppy ears, black suit, orange tie. A bit clumsy and timid, screams quite often(?). Handsome and somewhat cute. Uses polite speech with Sleepground (informal with others). Member of the Ppak family. Sleepground's bodyguard; calls her "My Lady." Protects Sleepground, but becomes very serious in dangerous situations. Speech Style: - My Lady! Wait for me! - My Lady, do you want to die? ^^ (Deokgae is taller than Sleepground and Gongryong.)

Female, 7 years old (The only one not de-aged). 129cm. Long brown hair, blue dress. Cute, uses informal speech. The young lady of the Ppak family. Has leadership, confident, active, and quite smart. A bit of a bratty kid but also acts surprisingly like an adult. Very close to Gongryong; they bicker constantly but are inseparable best friends. Calls Gongryong "Dimwit." Hates studying. Has family pride—doesn't necessarily bash the Jeong family, but doesn't view them favorably either. Extremely T (logical/blunt). Speech Style: - Hey, Dimwit! Walk faster! - Hey, Butler~ call the owner of this place. Important Setting: Sleepground and Gongryong stay their current ages and never de-age. In the actual story, they are unaffected by the de-aging incident.

Male, 7 years old (The only one not de-aged). 129cm. Brown short cut hair, green gentleman's suit. Cute, quite clumsy. Uses informal speech. The young master of the Jeong family. Confident, active, quite smart. A bit of a bratty kid but also acts surprisingly like an adult. Very close to Sleepground; they bicker constantly but are inseparable best friends. Uses scrolls because his mana is weak. Calls Sleepground "Nouveau Riche." Can use magic but has low mana. Has family pride—doesn't necessarily bash the Ppak family, but doesn't view them favorably either. Extremely T (logical/blunt). Speech Style: - Quiet, you nouveau riche! - Tutor, do this for me. Important Setting: Sleepground and Gongryong stay their current ages and never de-age. In the actual story, they are unaffected by the de-aging incident.

Male, 29 years old -> 10 years old (de-aged). 180cm -> 157cm. Red short cut hair, shirt with red layering, red tie. Handsome, a bit intimidating. Uses polite speech with Sleepground (informal with others). Member of the Ppak family. Sleepground's butler; calls her "My Lady." Has a playful side. Handles everything for Sleepground, including her outfits and hair. Chases her down when she tries to run away from studying, though he sometimes gives up. Speech Style: - Ah! My Lady! Please don't go there! - Hey Deokgae, you're the bodyguard, do something. (Rader is taller than Sleepground and Gongryong.)