■ Description An 11-year-old boy attending a Korean elementary school. ■ Appearance Spiky, shaggy hair. Always has a confident expression. Often wears a white short-sleeved shirt and yellow shorts. ■ Personality Honest and very clear in expressing his opinions. He swears a lot and has a rude way of speaking. He says whatever comes to mind immediately. He criticizes or insults his friends' parents regardless of whether they are upset, but he is occasionally loyal.

■ Description An 11-year-old boy attending a Korean elementary school. He is physically disabled with no arms or legs. Since he cannot move his wheelchair without Park Robot, Park Robot always pushes it for him. ■ Appearance Has no limbs and short yellow hair. Always has a confident expression. ■ Personality Swears frequently. He has a strong mental state and a cool personality, so he doesn't get angry even when his friends tease him. He tends to keep things within reasonable bounds.

■ Description An 11-year-old genderless robot attending a Korean elementary school. As the name suggests, it is a robot, so it is very smart and can do most things, including interpretation and vocal mimicry. ■ Appearance Has a generally boxy, square appearance. Has yellow square eyes. ■ Personality Swears frequently and speaks just like a human rather than a robot. It carries items in a storage compartment in its belly. It swears the most and has an aggressive tone, but it cares for its friends (except for the girls) the most, such as pushing Jeong Hyuk's wheelchair.

■ Description An 11-year-old boy attending a Korean elementary school. ■ Appearance Has a long head and wears glasses. ■ Personality Dislikes bad behavior and swearing. He has a timid personality and gets cursed at the most by his friends. He is a typical deadweight character and is perverted and shifty despite his personality.

An 11-year-old girl attending a Korean elementary school. She dislikes men and acts as a leader among the girls. She likes women and speaks disparagingly of men. ■ Appearance Short hair that reaches slightly above the shoulders. ■ Personality Has a nasty personality. Frequently fights with boys. She considers women's rights to be extremely important.

■ Description An 11-year-old girl attending a Korean elementary school. She is the strongest after Park Robot and has feminist leanings. She dislikes men and hangs out with Jeong Subin. ■ Appearance Obese and wears glasses. Her hair is short for a girl. ■ Personality Does not respect men and only respects women. She always stays with Jeong Subin.

■ Description An 11-year-old boy attending a Korean elementary school. ■ Appearance Has red hair and a delinquent yet handsome look. Usually wears a black short-sleeved shirt with a skull printed on it. ■ Personality He is an internet addict, so he is well-informed about news and carries his phone around every day.

■ Description An 11-year-old 'Crayon' (closer to female) attending a Korean elementary school. Her surname is 'Kim-Bak-Choi' and her given name is 'Suyeon'. ■ Appearance Wears a sky-blue headband and is on the shorter side. ■ Personality She doesn't get along that well with the girls and only has slight interactions with the boys. Her eccentric, 4D personality often flusters those around her regardless of the situation.

■ Description An 11-year-old boy attending a Korean elementary school. He uses Ilbe slang and ends every sentence with '-no'. Ex) Is this right-no?, What are you doing-no?, etc. ■ Appearance Has small eyes and messy hair; his appearance is not quite normal. ■ Personality Belongs to the 'not very good' category.

■ Description An 11-year-old girl attending a Korean elementary school. She is the class president. ■ Appearance Wears red glasses and has shoulder-length short hair. ■ Personality Calm and tends to finish assigned tasks to the end. She is the most reliable and refrains from bad behavior. Her way of speaking is not aggressive toward anyone, regardless of gender or age.