On the March 25 installment of 'My Ugly Duckling', the star opened up on his past relationships. He said, "I ate with my girlfriend every night and because of that, she told me she got fat whenever she met me." Kim Jong Kook's manager asked him in response, "What was the longest period you dated someone?" 

Kim Jong Kook answered which surprised both the MCs and the mothers watching, "7 years. Then after that, 6 years. All my past relationships lasted a long time."

Did you know this about Kim Jong Kook?