JEONGHAN X JOSHUA (SEVENTEEN) 1st Mini Album ‘DREAMSCAPE' Highlight Medley

In the Korean comments

One comment says, in translation, “It feels different from the track sampler, so I’m even more interested.” Another says the rhythm is instantly catchy and jokes, “I should change my ringback tone,” playing on the song’s title.

What the words mean

In the comment, 컬러링 (keolleoring) does double duty: it is the song title “Coloring,” but in Korean mobile-phone usage it also means the music callers hear instead of a standard ringing sound. The casual joke turns praise for the track into a promise to use it as a ringback tone. The same comment calls the rhythm 귀에 쏙쏙 (gwie ssokssok, popping neatly into the ears), an upbeat, conversational way to say it is immediately catchy or easy to take in.