Talented singer Navi is finally back on KBS Music Bank with her comeback track, "Diary"! In contrast to her previous up-beat, dance title tracks, "Diary" was composed with a sweet, relaxing beat based around a piano-strings melody, which goes well with Navi's throaty vocals. Navi expressed,

"I worked thoroughly in creating my own unique style. I hope for the day when people listen to my tracks and automatically say, 'Ah! This is one of Navi's sentimental ballads. It matches me perfectly'."