The song was written and produced by Duble Sidekick and Black Edition.[1] It was described by Billboard's Tamar Herman, as a "bright synth-pop track overflowing with rollicking brass and funky percussion". Lyrically, it is full of nuanced wordplay that incorporate the names of each of the six members.[2]
Chart performance
The song debuted at number 23 on the Gaon Digital Chart, on the week of July 21, 2018.[3] In its second week, the song peaked at number 11.[4] The song charted for 12 consecutive weeks in the Top 100.[5] "Sunny Summer" also debuted at number 25 on the Kpop Hot 100 for the week of July 22, 2018.[6] In its second week, the song peaked at number 10, staying for two consecutive weeks.[7][8]
The song was the 42nd best-selling song in July, 19th in August and 66th in September 2018.[9][10][11]
Music video
A music video for the song was also released on July 19, 2018. The music video starts with a quote from William Shakespeare's Sonnet 43. It also shows segments of hand-waving choreography with clips of the group spending their summer having fun together.[2]
