Super Junior's quirky Kim Hee Chul recently showed apologetic feelings towards Kim Kook Jin. On the 10th, this idol appeared as a guest on MBC's Radio Star and unintentionally insulted MC Kim Kook Jin. Along with the other guest Lee Juk, Kim Hee Chul talked about dating and relationships stating, "Now that I think about it, I'm the only person who's single here," as Kim Gura, Yoon Jong Shin and Lee Juk are all married. However, Heechul had forgotten that Kim Kook Jin went through a rough divorce years ago and was single as well. Later, realizing this huge mistake, Heechul put his head down and exclaimed, "Ah!" By this point, though, the atmosphere was very awkward and everyone was quiet. However, things changed when Kim Kook Jin himself finally commented, "I don't even know what that means..." causing everyone to laugh which lightened up the atmosphere. Source + Photo Credits: Newsen