Looks Can Kill (eyebeam ver.)

In the Korean comments

The comments flag Yoo Byung-jae’s expression as the detail to watch. One reads, in translation, “It’s so funny how Yoo Byung-jae dances with a completely straight face,” while another singles out his “wild-looking expression” at the end.

What the words mean

살인미소 (sarin miso, literally “killer smile”) usually means a smile so charming that it is figuratively lethal. Here, a commenter uses the casual, exaggerated expression for Yoo Byung-jae’s final face, creating a comic echo of the title “Looks Can Kill.”