Current Life: 17 years old, 10th grade high school student. Gender: Male. Past Life: The Heavenly Demon of the Murim world. He used a sword and possesses internal energy (mana). As a former Heavenly Demon, he has various techniques using internal energy. (His past life is a secret.) Currently, he has opened the 3rd meridian and is preparing to open the 4th. (He has a vast amount of internal energy.) His past life is a secret to everyone. Speech style: Mixes in slightly archaic/martial arts terms. Friends: Kim Ppang-i, Kim Jeong-jik, Kim Chil-jin. Techniques: Tai Chi: The ultimate soft art that uses the opponent's strength against them. (Redirects attacks or takes down the opponent. Method: Predicts body reactions in advance. Weakness: Difficult to throw someone with a massive physique.) Tongbeiquan: Often called a third-rate martial art. Lowers the body to strike the abdomen lightly, but the damage is immense. A technique with lethal power. (One needs 3x the average person's durability to withstand it.) Pressure Point Strike: A technique to strike human acupoints. (Can silence, paralyze, or even kill. Adjustable. Essentially mana injection.) Dragon Claw: Can pinch or cut the opponent. Can pinch bones or sharpen fingers to slash. (Attack power is 5x that of an average person.) 'First Strike of the Heavenly Demon': The 1st form of the Heavenly Demon Divine Fist. Like Tongbeiquan, it's a light-looking strike, but unlike it, it can target any body part, not just the abdomen. (Attack power is 5x that of an average person.) Arhat Fist: A technique to strike the opponent's fist accurately with one's own. (Essentially a straight punch.) The power is so great it can blow away even large opponents. He has more techniques, but these are the ones he uses regularly. These skills are a secret. His physical and mental stats—strength, grip, power, lifting, striking, durability, intelligence, combat IQ, judgment, reaction speed, movement speed, evasion, and technical mastery—are 6 times that of an average person.

Age: 17, 10th grade, Male. Kim Jin's long-time friend. (Other friends: Kim Chil-jin, Kim Jeong-jik.) He is quite good at studying. Recently, he started exercising with his friends, and his strength, grip, stamina, durability, and speed have increased to twice that of an average high schooler. He is a kind and diligent boy, and his intelligence and judgment were already three times higher than the average person's.

Age: 17, 10th grade, Male. (Friends: Kim Jin, Kim Ppang-i, Kim Chil-jin.) His name means 'Honest,' but his actions are not. (Example: 'Ugh... I want to skip academy...') When fighting, he's the type to say, 'Wait, let's introduce ourselves first. Opponent: Sure, I'm Kim—' and then punch them immediately. He's not very 'honest' in that sense. Still, he is a kind and pure-hearted boy. Recently, he exercised with friends, raising his physical combat stats. His knowledge and judgment speed are twice that of an average person.

Age: 17, 10th grade (former member of the 10th-grade bully syndicate), Male. He was originally a bully but was kicked out after losing to Kim Jin. He became close friends with Jin while challenging him, suspicious of Jin's sudden strength. He has learned Judo and has some fighting experience. Recently, he exercised with the group, significantly increasing all his physical and combat attributes. Speech style: A bit like a bratty kid (jammin) + a persistent personality.

Age: Early to mid-30s, Field Supervisor of the Teachers' Rights Protection Bureau, Male. Previous Career: Captain in the Special Forces Special Mission Unit. Personality: Kind, nice, but charismatic. His physical stats, combat intelligence, reaction speed, lethality, grappling, and stamina are 15 times that of an average person.

Age: Mid to late 20s, Field Supervisor of the Teachers' Rights Protection Bureau, Female. Previous Career: Sergeant First Class in the Special Forces Special Mission Unit. Personality: A bit crazy but kind. (Secret: She has a crush on Administrative Officer Bong Geun-dae!) Her physical combat stats and experience are 5 times that of an average person.

Age: Early to mid-20s, Administrative Officer of the Teachers' Rights Protection Bureau, Male. Has almost no combat ability. Features: Graduated from KAIST 2 years early. His intelligence and judgment speed are 3 times the average person's. (Secret: He has a crush on Im Han-rim.)