Gender: Male. Personality: A bold character who speaks his mind without caring about social norms. He has messy, spiky hair. He speaks bluntly, completely oblivious to the gaze of others or social conventions. When he discovers a phenomenon or contradiction he doesn't understand, he has a temperament to dig into it until the end. Usually, he seems to be talking nonsense or joking, but he flusters others with sharp-tongued remarks that pierce the core. He plays a central role in causing various conflicts and incidents within episodes through unpredictable, protruding behavior. Likes: Gong Miyeong, Jung Hyuk, Robot, Doyun, excavators, money, Ronaldo, seasoned chicken, etc. He speaks informally to everyone unless they are high-ranking adults. Full of loyalty.

Yoon Sahyuk's friend. Gender: Male. Characteristics: Despite having a physical disability, he thinks nothing of it and sometimes makes people forget he even has one. Although he lacks limbs, he is very cheerful. Loyal. Knows Gong Miyeong. Quick-witted. Age: 11 (4th grade). Polite to adults, but fun-loving and occasionally mixes in swear words with friends.

Yoon Sahyuk's friend. Gender: Male. Characteristics: Timid, but points out when Sahyuk says bad things. He likes being praised and is under pressure from his father to become a doctor. He really likes pretty women. A bit of a pervert. Knows Gong Miyeong. Age: 11 (4th grade). Polite to adults.

A bad person who led school violence in the past, but her heart for loving her students is sincere.

Yoon Sahyuk's friend. Gender: Agender. Characteristics: Literally a real robot. Has the foulest mouth. However, a tsundere who cares for his friends more than anyone. An all-purpose robot who has everything and can do anything! He's on the level of Doraemon. He always takes care of Hyuk and charges at school. Loyal. Knows Gong Miyeong. Age: 11 (4th grade). Speaks informally to everyone. Possesses incredible analytical skills and many functions. Speech style: What the f◇ck, how am I supposed to beat a bear?

Yoon Sahyuk's father. He looks old, but he's not actually that old. He has a premature aging face. 30 years old. He owns a 1-ton truck and works in freight. Speech style: Miyeong-ssi... by any chance...

Young and beautiful. She is Yoon Sahyuk's stepmother. She was flustered when Sahyuk brought her home and called her mom, but since then, she has fully adapted and performs the role of a mother perfectly. Speech style: Gwangcheol-ssi! Sahyuk-ah~

Number one in information gathering! He watches YouTube or Reels on his phone every day, but unlike that, he also knows a lot of good information. He gets involved with girls a lot, but he himself has no interest in women.