You can see his shoes sliding the entire performance in the fancam video here:
like for example at around ~0:43 or 0:56-57. His partner has a more rubbery heel so he is sliding less. The stage is literally so polished you can see their reflections…
It always amazes me when idols perform in conditions like that. I’m glad he didn’t fall. Props to Sunghoon for putting up a beautiful performance when he literally could barely stand straight….
by Key_Elk5906