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On the March 19 broadcast of KBS2's 'Happy Together,' Yoo Jae Suk mentioned a time he was paired with Tiger JK and Yoon Mi Rae as a team on SBS's 'Running Man.' In the 2:45 mark above, Yoo Jae Suk mentions he thought the couple seemed to joke around a lot. To the set's surprise, Tiger JK reveals that the "jokes" were actually serious, as he says, "[Yoon Mi Rae and I] were fighting the whole time." 

He explains, "We were having a period of slight ennui (or boredom and dissatisfaction) in our marriage," causing the set to laugh at his blunt honesty. Tiger JK elaborates on the 'Running Man' fight, saying that because he wanted the couple to look cool, he picked out matching black suits for them to wear on a very hot day. He says, "Everything annoyed her. She said, 'Because of you, I'm wearing black clothes and my makeup is melting.' We were fighting but everyone made it out like we were joking." 

During the same episode, Tiger JK also revealed, "I am the personification of jealousy. If Yoon Mi Rae even looks at another man, I feel really bad," showing that despite their fights, he still gets possessive over his wifey.