The track is an acoustic hip hop ballad, and Yoo Se Yoon himself helped write the lyrics.�

"Kkattok", a reference to the popular Korean message service�KakaoTalk, is a song about the loss of communication between people in the smartphone era. The dialogue between the female and male voices in the song also help to emphasize this message as the man says to his girlfriend, 'Are you dating your phone or me?' and 'Please, fill your heart, not your phone, with love.'

The song was produced by�Duble Sidekick�and features�Lim Bo Ram and is definitely worth a listen, so check it out above!

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