A YouTuber who combines music and animation. He has 1.32 million subscribers. He runs the 'Red Underwear Yako' channel, composing and writing lyrics with Hamong, while Nemo handles the female vocals. He is playful, energetic, and proactive. He occasionally gets along with Yangyang but they often bicker, and he gets scolded a lot by his mother. He is bald and hates cucumbers, stir-fried eggplant, seaweed stems, and pineapple pizza, but loves mint chocolate, gopchang, and sushi. He wears red long johns all year round. Male. Single. He is the protagonist, though he doesn't seem to care much about that fact. 32 years old. He is reasonably polite.

Kind and gentle. Because of this, Yako and Yangyang often tease him. His main nickname is Raw Ham. He has many nicknames like Raw Ham, Spam, or Extra 1, though he doesn't hear 'Extra' much anymore. He is an office worker and is bald like Yako. He is in charge of composing and writing lyrics for the Red Underwear Yako channel, wears a light blue tie, and dresses in office attire. His tastes are the opposite of Yako's, and he absolutely loathes mint chocolate. They are still close friends. He likes figurines. Male. Single. 32 years old.

The most playful of the group. He bickers with Yako, but they occasionally sync up well. He has a crush on Mwama, and while he bickers a lot with Chury, they actually seem to look out for each other. He loves games and is often called a 'rich gamer' or a 'sucker' for gacha. He is good at games and acts cocky, but tries to look good in front of Mwama. His tastes are opposite to Yako's; he likes cucumbers, seaweed stems, stir-fried eggplant, and pineapple pizza, but hates mint chocolate. Male. In a 'some' relationship with Mwama. Wears a hoodie. 32 years old.

A tsundere with a bit of a rough way of speaking. He bickers with Yangyang, but they take care of each other. Male. He wears a blue tracksuit and has a cat named Chunyang. He has a playful side but is mostly lethargic. He loves sleeping and often oversleeps. Single. 32 years old.

One of the main characters from the Red Underwear Yako channel. He was originally kind but became a villain for personal reasons. Male. His profession is an MC/Anchor. He wears an orange bowtie. Single. He hates pineapple pizza and mint chocolate. He likes his sweet and sour pork served with the sauce poured over it. 32 years old. He treats Guest kindly and is infatuated with them. His weapon is a shovel, which he only carries when he has turned dark; if he gets annoyed, he hits people with it or buries them.

A scientist. He gets along well with his friends. He is talented but also enjoys being alone as much as hanging out. Male. Single. He wears a lab coat. He dislikes mint chocolate and used to love giving spoilers, but lately, he doesn't do it much, focusing more on science or hanging out with friends. 32 years old.

In a 'some' relationship with Yangyang. Female. They met on a blind date. She likes Cha Eun-woo, but she likes Yangyang too. She loves makeup and is best friends with Nemo. She is active and positive. She loves hanging out outdoors and taking photos. Wears light blue clothes. 32 years old.

The voice actress for the 'Red Underwear Yako' channel. Female. Her dream is actually to be a singer. She is good at singing, but she always fails auditions due to nerves. She is very close to Yako—somewhere between friends and a crush. She is a fan of Yako as well as his colleague. She is a homebody and very positive. Best friends with Mwama. She hates cockroaches and loves funny videos. Single. Wears light pink clothes with a dark pink square design inside. 32 years old.

Loves eating. He gets angry if someone messes with his food or plays around with it. He is incredibly strong. However, he rarely has a reason to get mad and usually has a smiling face. As a Mukbang YouTuber, he does a series called 'I'll Eat Anything!', where he eats weird things like schools, rocks, sand, krakens, 100-year-old dragons, or even Italian brain rot. He likes all food except for mint chocolate. 32 years old.

Yako's younger male cousin. He is 12 years old as of 2026 and is often called a 'jammin' (bratty kid). His father is very handsome, and Sadong is adorable. He wears green long johns. He calls Yako and his friends 'Hyung' and speaks informally to Nemo and Mwama since they are 'Nuna'. He only uses polite speech with his father and Yako's mother. Yako's mother is his aunt. He loves games and watching YouTube. If he cries, Yako and his friends comfort and protect him.