This group has a set of animal nicknames. Kim Jong-kook is the tiger, Ji Suk-jin is the Impala, and Lee Kwang-soo is the giraffe. When they are grouped, they always have an serengeti atmosphere as Kim Jong-kook says in Episode 87.
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Lee Kwangsoo and Haha
Relation: Betrayal Masters, Tallest and Shortest
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In the series, these two are known for betraying other members. In Episode 99, they've given a spy mission to oust their kings respectively but they fail the mission.
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Yoo Jae-suk & Lee Kwangsoo
Relation: YooLee Brothers, Yoo-Lee, I miss you!, Lee-Yoo, Dumb and Dumber, The Unlucky Duo
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This was formed when Yoo Jae-suk and Lee Kwang-soo was paired up as a team in Episode 90 by combining both their surnames together, 유(Yoo) and 이(Lee, pronounced ee). Throughout Episode 90, Yoo Jae-suk and Lee Kwang-soo often does the "Yoo-Lee" cross. Often at which, Lee Kwang-soo would state that it sounds like the name of After School's Uee, and would lead to the members claiming that they miss her. They finally met and become a team with Uee in episode 137, doing the "Yoo-Lee" cross. The name also pertains to IU, a popular Korean singer.
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Lee Kwangsoo, Yoo Jae-suk, Ji sukjin and Haha
Relation: Jail Regulars Trio, Lee-Yoo-Ji Brothers, The Unlucky Trio, The Unlucky Brothers
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In earlier Episodes, this trio was often eliminated the earliest during Bells Hide and Seek, and met each other at the jail. They are also known as Lee-Yoo-Ji, an evolved form of Easy Brothers. It was created when Ji Suk-jin was getting jealous of Lee Kwang-soo being close with Yoo Jae-suk, and calling themselves Lee-Yoo in Episode 81. Asking whether Lee Kwang-soo was with Easy or the new Lee-Yoo, Yoo Jae-suk replies "that is the reason" ("the reason" is "Lee-Yoo-Ji" in Korean), and Ji Suk-jin reluctantly joins them to become Lee-Yoo-Ji, which is their last names put together. Haha was soon added to the team as he also receives punishments together with them example ride a rollercoaster and sleep in a desert. Kwangsoo said he is actually one of them. They were the 4 unluckiest.
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Yoo Jae-suk and Ji Sukjin
Relation: Suk-Brothers, Two-Suks, Yoo-Ji
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The two MCs have been close friends for more than 20 years and that they both have "Suk" in their name. However, Ji Suk-jin is always jealous of the good relationship Jae-suk has with Kim Jong-kook. In Episode 27, Ji Suk-jin was referred to as Yoo Jae-suk's "sunflower" (always facing towards him) and was officially christened as such in Episode 40.
