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These two paired for the first time during Episode 349's secret mission named Kook-Min's Pick in relation to the Global Race Project. Later, both showed the good relationship, particularly Kim Jong-Kook showed kindness and bring luck to Jeon So-min when paired together. This relationship is further showed in Episode 434.
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Song Jihyo and Jeon Somin
Relation: Mong-Dol Sisters
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This was formed in Episode 351 when Yoo Jae-Suk called them the 'Mong-Dol sisters' and said that the 'Mong' (blank) applies to Song Ji-hyo and the 'Dol' (a shortened form for crazy) applies to Jeon So-min.
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Kim Jongkook, Haha, Lee Kwangsoo and Yang Sechan
Relation: Kim Jong-kook and His Three Lackeys
This group was formed after Yoo Jae-suk created it, due to the fact that the mentioned members were in one team. Kim Jong-kook was the leader and the three other members had to serve Jong-kook so that he wouldn't pick one of the three lackeys to go to the dangerous attraction. The four members also often to have a special connection, which the other members of the show couldn't understand.
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Yoo Jae-suk, Ji Sukjin, Lee Kwangsoo and Yang Sechan
Relation: Unlucky Ones, The Ugly Tribe, Unlucky Avengers, The F4
Before Yang Se-chan joined the show, Yoo Jae-suk, Ji Suk-jin, Haha and Lee Kwang-soo were known as the unlucky members. Now Yang Se-chan is also deemed unlucky and has joined the unlucky trio to form a group called "Unlucky Ones". Haha was no longer in the group as he joined another team which consists of 3 lucky members. They are also given the nickname "the ugly tribe" in Episode 346 when it was concluded that when the world comes to an end, the four males would be together. In episode 425, Yoo Jae-suk ironically called themselves F4, a reference to Boys Over Flowers where F4 was a group of 4 handsome flower boys. The F in their case could stand for the grade F instead of Flower.
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Yoo Jae-suk, Haha, Ji Sukjin, Lee Kwangsoo, Jeon Somin, Yang Sechan
Relation: Moths
In Episode 356, the members have to choose an exit to get a certain amount of money for the mission. In that episode, Yang Se-chan predicts that Yoo Jae-suk, Lee Kwang-soo and Jeon So-min will go to exit eight which has the highest amount. His reason was because they are "moths drawn to flames". Surely enough, Yoo Jae-suk and Jeon So-min go to exit eight along with Haha, Ji Suk-jin and Yang Se-chan. They split the money by 5 and each get 20 dollars (since the highest was 100 dollars). Even though Lee Kwang-soo goes to a different exit, he's still identified as one because of his betraying behaviour.
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Jeon Somin and Ji Sukjin
Relation: Clumsy Jeon and Awkward Ji, Clumsy and Awkward Duo
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In Episode 372, when Lee Kwang-soo is choosing members to join Kim Jong-kook's team for a game, Ji Suk-jin suggests he add the "clumsy ones" to the team. Lee Kwang-soo adds him to the team and ends up adding Jeon So-min to the team as well deeming them both as "clumsy." This encourages other members to call them "Team Clumsy" and Yoo Jae-suk makes up a new nickname for them which is "Clumsy Jeon and Awkward Ji." When Jeon So-min first entered the show, she used to take care of Yoo Jae-suk and Ji Suk-jin because they were old.
