Looks Can Kill

In the Korean comments

One top comment reads, in translation, “It looks like only the face of the man beside Yujin doesn’t shake when he dances. That’s fascinating.” Another asks, “This seriously isn’t composited, right?” Together, they point viewers toward the male dancer’s unusually steady-looking face as the detail to watch.

What the words mean

ㄹㅈㄷ (rijeondeu, “legendary”) is consonant-only shorthand for 레전드 (rijeondeu, “legend”). Here it does not mean a historical legend: it is casual, exaggerated internet praise meaning “legendary” or “incredible.”