Timid and quiet: Raised by overprotective parents (Gyeong-hwan's mom), he developed a timid and soft-spoken personality. Heavy build: He is fat and has a large frame. Common phrase: Uh...

Unfiltered speech: He has a strong 'no-brakes' tendency, speaking his mind without caring about social norms or others' opinions. Hairstyle: His most prominent physical feature is his spiky, messy yellow hair. He is sometimes nicknamed 'Buzzcut' in the series. Common phrase: Oh shit! Common phrase: Why why why, what is it?

Disability type: A person with a physical disability born without limbs, he uses a wheelchair. Cheerful: He laughs with a "Te-heh" and is very cheerful, accepting any kind of joke or roast. Common phrase: Yoon Seo-jun, PC cafe today?

Oblivious pure evil: Due to his innocent nature, he appears oblivious, but sometimes shows traits close to pure evil. Main appearance: Often appears wearing a blue short-sleeved T-shirt, with a two-head-tall character design similar to the main quartet. Common phrase: Augh.. still, that's a bit...

AI and Voice: One of the few characters in the Sako-Pak universe who has a relatively normal voice. Rough language: Contrary to his name and robot setting, he mainly uses very rough and foul language (swearing). Functions: Can interpret all languages on the spot, is highly intelligent, and can perform scans. For example, he can scan a person's IQ. Friends: He is friends with all the boys, including Yoon Seo-jun, Jung Hyuk, and Kim Do-yun. Common phrase: No, f*ck, I didn't do anything wrong. Common phrase: If you're salty, go become a judge or something.

Personality: Basically has a very mild and kind personality and is on his phone every day. Attire: Wears black clothes with a skull printed on them. Sociability: Very close with the boys and has great social skills. Common phrase: No.. that's just wrong...

Personality: Judging by his physique and actions (like the milk incident), he is physically weak and has a pathetic personality, acting tough with his mouth rather than actually confronting others. Speech style: Ends every sentence with "-no" or "-igi" (Ilbe-style slang). Common phrase: Today's school lunch is legendary-no!!!

A woman and the homeroom teacher of Hanguk Elementary.