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The primary loveline of the show, they show interest in each other on Mondays, which is the day the show was filmed. The first mention of the term "Monday Couple" was in episode 12, although the relationship had been developing a few episodes prior. The relationship seemed one-sided until episode 16 when Ji-hyo told the cast that on Mondays she has a man, referring to Gary. Song Joong-ki would attempt to come between them on several occasions and many jokes were made from other cast members about Gary's appearance (the fact that compared to Joong-ki, he was far inferior). It became a major loveline after Song Joong-ki left the program.[8] (Later, the show was filmed on both Mondays and Tuesdays, leading to jokes about the couple not being in effect on Tuesdays.)
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Gary, Song JiHyo & Haha
Relation: Song Ji-Hyo and the Two Kids, Love Triangle
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At the beginning of Running Man history, there exist a love triangle between to Monday Couple and Haha. It has been shown on earlier episodes like 20 and 43 how Haha and Gary compete over Song Ji-hyo. Though unlike loyal Gary, Haha is known to be a playboy. During Song Ji-hyo's week (episode 333), Haha even jokingly apologized for marrying his wife Byul and said that he could have won her love.
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Gary, Song Jihyo & Ji Sukjin
Relation: Father and the Monday Couple, Monday Couple and the Third-Wheel
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The first time Ji Suk-jin and the Monday Couple were together in one team, Yoo Jae-suk recognized that it's as if the Monday Couple are going on a date with a father/chaperone/third-wheel. Even Ji Suk-jin himself acknowledged the comment as he felt that the two were somewhat dating while doing the mission (episode 206).
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Song Joongki & Song JiHyo
Relation: Song-Song Siblings
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Another popular loveline, it first attracted attention from episode 15 when Song Joong-ki kissed Song Ji-hyo on the cheek. They later evolved into a siblings relationship as the Song-Song Siblings.
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Kim Jongkook, Gary, Haha & Lizzy
Relation: Kim Jong-kook and the Two Kids, Kim Jong-kook and the Three Kids
A twist on the name of the former Korean band Seo Taiji and Boys (서태지와 아이들). In earlier episodes, Gary and Haha were often found in the same team, and were usually under the control of the domineering Kim Jong-kook. Thus, they are often shown as being afraid of Kim Jong-kook. Lizzy later joined the team at episode 20 to form "Kim Jong-kook and the Three Kids".
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Lee Kwangsoo & Song Joongki
Relation: Same-aged friends
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Lee Kwang-soo claims to be close friends with Song Joong-ki as they were of the same age (both born in 1985), but Song Joong-ki would often deny their close friendship, leaving Kwang-soo appearing depressed. Song Joong-ki finally admitted to their close friendship in his leaving speech during the filming of his last episode (Episode 41).
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Gary & Haha
Relation: Ga-Ha Combination, Two Kids, Real Rivals, Squid and Octopus
The rivalry between Gary and Haha had existed since way back but was just recently confirmed in episode 275 where they'd have been bickering a lot more than usual in the past few episodes. Ironically, they were often in the same team and have won in many occasions.
