His attitude on the 25th's episode of 'A Hyung I Know' became problematic because of how he acted to Min Kyung Hoon. The situation came forth when Ga In admitted she didn't have a driver's license, and Min Kyung Hoon joked, "Did you get it cancelled (because of drunk driving)?". 

Heechul responded to this by grabbing his shoulder, and saying quietly, "I told you to stop." The volume of his tone and his expression suggested that he allegedly did not mean for the interaction to be released on broadcast, and was reacting in such a way because fellow Super Junior member Kangin had an issue with drunk driving. Viewers were unimpressed at the way he acted. The clip in controversy is above.

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Heechul posted a lengthy response on his Instagram, writing, 

I was wondering why my Instagram was blowing up, and I see it was because of my expression during. I can't see it all because I'm overseas right now, so excuse my babbling... I don't know how it was broadcast, but we had absolutely no problems while filming. As usual, we joke around with each othe.. During the breaks, the hyungs and I talk among each other and say things such as, "Can I insult you more", "Of course, sure", "Hey, you were pretty good", and "You've improved a lot", and more, and we finished off on a good note. Even when I asked the staff what was happening, they had no idea why it could be problematic... the mood on set was that good.

The reason why I'm writing this is because I'm worried because of this, Kyung Hoon and my relationship might get awkward and we'll shy away from each other. I know everyone can feel differently on seeing my expression so I apologize. But when I saw malicious bullsh*t saying that I cursed with a cold expression, I wanted to report them all. I hate these kind of rumors because of the 'barbed wire' incident years back.. 

The members like the dirty chemistry.. So even if we don't look that warm on broadcast, we really curse around, drink, eat, and otherwise act warmly like real brothers. ^_^

There are people who like the way I am, and there are of course people who don't like the way I am. I'm not at the stage where I can fit everyone, so I believe in the members, the staff, and I want to give enjoyment to the people who like me.

I hope can help everyone forget their hard, exhausting week and laugh without troubles. On another note, Kyung Hoon and I have been preparing a project for a bit... We'll release it soon.

Thank you for reading this long post. Have a good night ^_^

What do you think of the situation?