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The album contains five songs, including the eponymous title track, "Sunny Summer," described by Billboard as having "airy, exuberant vocals that bounce along over the melody, [the song] is driven by the group's refreshing vocals tones as they sing about having a memorable summer together."[1]
^"第30 週 統計時間:2018/7/20 - 2018/7/26". 5music (in Chinese). Five Music. Archived from the original on July 13, 2016. Retrieved August 14, 2018.
To access, select the indicated week and year in the bottom-left corner
^"2018년 Album Chart". Gaon (in Korean). Korea Music Content Industry Association. Archived from the original on January 11, 2019. Retrieved January 20, 2019.
"Gaon Album Chart Year-end 2018". Gaon (in Korean). Korea Music Content Industry Association. Archived from the original on January 11, 2019. Retrieved January 20, 2019.