BOYNEXTDOOR's Concert with Towel Swinging

In the Korean comments

One Korean-language comment supplies a precise rewatch cue, saying, in translation, “Woonhak smiling while singing in the middle is so cute.” Another explicitly contrasts the styling with Japan, asking why “we” do not also get the varied hats, glasses, and dolls used there.

What the words mean

“샤우팅 하는 백두산 호랑이 실존” (syauting haneun Baekdusan horangi siljon, literally “a shouting Mount Baekdu tiger exists”) is not an animal sighting. It is a casual, exaggerated way of calling the unidentified shouting performer a remarkably fierce or powerful presence.