Hosts
| Name | Joined | Nickname | Character Description and Notes |
|---|---|---|---|
| Yoo Jae-Seok (유재석, Host-in-chief) |
Since April 2005 | Captain Yu/Yu banjang (유반장) The First-in-command (1인자) National MC (국민 MC) The grasshopper (메뚜기) Mr. Playboy Yu/Nal Yu (날유) The Sun (해님) God Yu(유느님) 저쪼아래 |
As host-in-chief, he led all Muhan Dojeon members in attempting to reach the goal of each episode. In 2008, he was temporarily replaced by Park Myung-Su, but was reinstated as host-in-chief several weeks later. |
| Park Myeong-su(박명수) | May - July 2005 Oct. 2005 - Incumbent |
Giant Star/Geo-seong (거성) Father (아버지) The Second-in-command (2인자) The Son of the Devil (악마의 아들) Rash Man(깨방정) Sancho Park (산초박) Alien (외계인) The leafhopper/Rice insect (벼멸구) Worthless brother (하찮은 형) Unique Myeong-su (고유명수) (A play on 고유명사/"Proper noun") CEO Park/Park sajang (박사장) Point five (쩜오) Great Park (그레이트 박) Flag Park(박깃발) The odd one out (쭈구리) Peter(피터) BBB (박번복) Ten Jobs (십잡스) Mr. Tricky Park Mr. Reversal Park Mr. Flag Park |
Park has continuously proclaimed his nickname (Geo-seong, or Giant Star). He is often referred to as "Father" by the rest of the members due to his elderly look and his position as the oldest member of the program. This is especially prevalent when Myeong Su's receding hair is flattened or his make-up is removed. See his page for more details. His (on-air) persona is that of a veteran grumpy "upperclassman" of the other members. He often shouts or reprimands his "underclassmen," usually about humorously trivial matters. |
| Jeong Jun-ha(정준하) | Since March 2006 | The Helmet (헬멧), The Lord of Eating (식신) Monster (괴물) The Third-in-command (3인자) Stupid brother (바보형) Mr. Jeong Joong-ang (정중앙씨) Fat-fatso (뚱뚱보) Jjeori Jjang (쩌리짱) Global Moron Cool Guy(쿨가이) Manager Jeong (정총무) Jeong Jun-yeon-a(정준연아) (Kim Yeon-a Parody) Somewhat lacking but a good friend (약간 모자라지만 착한 친구) Jonathan(조나단) |
His character is mainly defined by 3 things: his size (often referred to as being 0.1 tons, or 100 kilograms), appetite, and a degree of slowness in judgment. His extraordinarily large head (supposedly 8 kg) has gotten him, on a few occasions, called "Chivas Degal" (Degal = is a shortened word for "Degari", a vernacular word for "head"). In the 50th episode special of season 3, he was challenged to eat 50 plates of noodles in five minutes. The plates altogether weighed about 10–30 kg. (He succeeded, but had to go straight to the lavatory and subsequently slept in the back of the studio). On episode 61 of season 3, he went to a hair salon with Hongchul to curl Hongchul's hair. He asked a woman who was working there if she knew Jun-ha's name, but she said Joong-ang by mistake. Since that time, the members, including the creator Yu Jae-seok, have frequently teased him as Mr. Jeong Joong-ang (정중앙씨), which means 'Mr. Square-in-the-middle'. |
| Jeong Hyeong-don(정형돈) | Since April 2005 | Fatso (뚱보) Awkward fatso (어색한 뚱보) Jinsang (진상, nuisance) Jeong Hang-don (정항돈) The Moon (달님) Doni (도니) Crazy Existence (미친존재감) Gaehwadong Orange-Tribe (개화동 오렌지족) |
A comedian by profession before joining the team, Jeong Hyeong-don used to appear in the Korean comedy show Gag Concert (where Do-Re-Mi Trio being one of his many skits). However, over many episodes, he has demonstrated remarkable talent in everything imaginable (for example, catching grapes with his mouth or playing a Korean jump-rope game) except being funny. He is teased by the other members for this. His character is also defined by the ability to make anyone around him feel awkward. |
| No Hongchul(노홍철) | Since April 2005 | Stone Kid/Psychopath/Crazykid/Dol+I ('돌+아이'), Childhood friend(with Haha) (죽마고우) Quickmouth (퀵마우스) Noh Jji-rong (노찌롱) Noh big-jaw(노하관) Fraudster (사기꾼) Affirmation Noh (노긍정) Anal Fistula Patient(치루치루) |
'돌+아이/Dol+I' was created by Yu Jae-seok during episode 22 of season 3. Quickmouth was his original character, due to his ability to speak very rapidly. 돌+아이 (when written without the plus sign) is a Korean curse word meaning psychopath, or an extremely crazy person. Since this is a show watched by families, the staff humorously put a plus (+) sign in the middle to separate the word so its literal meaning becomes 'Stone+Kid' when in actuality it means 'psycho'. On-screen graphics often depict this nickname by displaying a large capital 'I' that looks to be made of stone ('아이' is pronounced like the letter 'I'). |
| Ha Ha(하하) (Ha Dong Hoon, 하동훈) |
December 2005 - March 2008 March 2010 - Incumbent |
Shorty (단신) Childhood friend(with No Hongchul) (죽마고우) Little one (꼬마) The M.A. Ha (석사 하하) The Top Little one(상꼬맹이) haroro (하로로) Compares in the same age, The friend who lacks (또래에 비해 떨어지는 친구) |
Currently the youngest member of the program, Haha was long considered the cutest and best-looking member of the cast. He is also the most-educated member, having obtained a Master of Arts in Theatre & Film at Daejin University; however, during the episode of the 50th special, he got only 20 points on a 100-point elementary-level spelling test. In episode 62 of season 3, he sang a song called 'A Little Boy's Story' (키작은 꼬마 이야기) as a tribute to his short height, which is a constant target of ridicule among the cast. It was a huge sensation with viewers. Haha temporarily left the show from March 2008 through March 2010 in order to fulfill his mandatory military service. In his final episode before entering the service, Haha performed at a guerilla concert that was secretly organized by his fellow co-hosts. |
| Gil(길) (Gil Seong-joon, 길성준) |
Since April 2009 | Baldy/Bbaak-Bbaak-ei (빡빡이) Come between-Gil(이간길) Honey jar(꿀단지) Fat-fat-fatso (뚱뚱뚱보) Ip-sae (입새) (as he only brushes his teeth once a day) Gilmeo (길메오) (as a 'cameo' proclaimed by Yu Jae-seok) absurdity (무리수) The friend who viviparous is not fun (태생적으로 재미없는 친구) |
Gil made his first appearance on an episode which featured Korean figure skater Kim Yu-na in April 2009, ostensibly substituting for Jeong Jun-ha, who had to leave the episode recording early. He remained a de facto member of Infinite Challenge until he became a full member later that year. During the Boxing episodes in January 2010, Gil showed off his 9-year-long training in the sport. Gil is often called the Unfunny Friend due to his inability to ad-lib as quickly as the other co-hosts. |
| The following were previously permanent co-host of Muhan Dojeon, but have since left the show, due to the mandatory Korean military service obligation, as a Public Interests Service personnel. |
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| Jun Jin(전진) (Park Chung-Jae, 박충재) |
June 2008 - November 2009 | Junstin Jinberlake (전스틴) The roll-in kid (굴러들어온 놈) Jan Jin (잔진) The Million Dollar Boy (백만돌이) |
In June 2008, Shinhwa member Jun Jin appeared on the show to replace Ha Ha. Jin showed extraordinary physical talent and was a target for all the other members of Muhan Dojeon, who envied his looks and abilities during many challenges. |
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