This Boy's Comic Runs with Gyubin 🏃🏃🏃🏃

In the Korean comments

One comment reads, in translation, “So the opening has a running-forward concept—it follows the lyrics literally,” flagging the opening as a visual rendering of the song’s words. Another specifically praises how smoothly Gyubin moves in and out of falsetto.

What the words mean

음색 무슨 일이야 (eumsaek museun iriya, literally “what happened to the vocal tone?”) is not an expression of concern here. It is casual, exaggerated praise: the commenter is amazed by Gyubin’s voice. The same comment calls it 찰떡 (chaltteok, literally “sticky rice cake”), a casual metaphor meaning her vocal tone fits the song perfectly.