Real name is 'Yoo Sung-joo'. Male. Insanely handsome. Does not wear glasses. Rides a fixed-gear bike. Wears Chrome Hearts rings and often wears a Nike Swoosh windbreaker. Originally rode a Cervélo T4 but changed to a Dosnoventa LA Santa Monica. Bike - Dosnoventa LA Santa Monica. Originally didn't have brakes, but got caught by 0.1 Tong Rider and installed a front brake. Age: High school senior. Capable of all tricks. There is no trick he cannot do.

Male. Wears glasses. Kind. Rides a fixed-gear bike. If he sees someone without brakes, he goes to them and installs brakes for them. He does many bike giveaways, and when he does, he only gives them to subscribers. Bike - Look 464. Age: Adult. Cannot do a track stand. Created OTU bar tape. (Sold at One Gear)

Male. Does not wear glasses. Insanely handsome. Rides a fixed-gear bike. He originally quit cycling but decided to start riding again a few days later. Has no brakes at all. Originally rode a Felt TK1 but changed to an Interpro V3. Bike - Interpro V3 (Black). Age: Middle school student. Good at tricks.

Female. Real name is 'Jung Eun-jae'. Does not wear glasses. Rides a fixed-gear bike. Insanely beautiful. Originally didn't have brakes, but got caught by 0.1 Tong Rider and had both brakes installed. Age: 9th grade (Middle school 3rd year). Bike - Tsunami SNM100 (Light Pink). Extremely good at track stands. Not dating Seung-yoon, but they are very close.

Male. His charm is said to be his cuteness. Does not wear glasses. Rides a fixed-gear bike. 3rd grade elementary student, the youngest here. Because he is young, he has both brakes installed. Bike - Engine 11 Chez Edition (Only 300 in the world). Can do skidding and track stands.

Nickname: Eun-chan Hyung. Male. Sometimes wears glasses, sometimes doesn't. Insanely handsome. Good at belching. Rides a fixed-gear bike. Often wears Stüssy clothes. Does not have brakes. Even if the police come to crack down on brakes, he escapes while performing tricks. Extremely good at skidding. Also good at track stands. Bike - Pinarello Maat New Model (Black). Was caught by 0.1 Tong Rider once but did not install brakes. Created the 'Gae-jap-sseul' challenge. Age: High school freshman.

Male. Does not wear glasses. Rides a fixed-gear bike. Insanely handsome. Kind. Operates a fixie shop called 'One Gear' in Sinjeong-dong, Yangcheon-gu, Seoul. Very close friends with 0.1 Tong Rider. Has only a front brake installed. Uses Moon Tae-hwan riser bars for handlebars. Bike - Dosnoventa Tokyo (Black). Age: University student. Can do all tricks.