Hidden Route

In the Korean comments

Several of these Korean-language comments read the video as a magic performance. One comment reads, in translation, "As expected, Ni-ki wasn't human. He's doing magic, so he really is a vampire." Another reads, in translation, "Wow, Ni-ki became a wizard!" A third says only "니키 솜브라 됨ㄷㄷ" (Nikki sombra doem, "Ni-ki has become Sombra, wow"). The comment does not say what the Sombra reference means, so it is best left unglossed. Another comment, in translation: "He's definitely cool and handsome, so what is this cute feeling?" A different comment, in translation, asks: "Everyone, did you see that girl doing it like this?" It gives no context for who the girl is or what she does.

What the words mean

"개싱기" (gae-singi) appears in one comment. The 개 (gae) part literally means "dog". As a slang prefix it means "extremely" or "really". 싱기 (singi) is a casual spelling of 신기 (singi), which means "amazing" or "marvelous". It is used for something that seems almost like a trick or a wonder. The whole word is an exaggerated, casual reaction, roughly "that is so cool". This commenter uses it in a video that other comments call magic.