Osen reported that the members finished filming the music video for the single "Power Up" in Gyeonggi Province on July 19 and days later, SM Entertainment revealed that the EP would be released on August 6 and was titled Summer Magic.

[8] During the press conference for their second solo concert 'REDMARE' at the Olympic Park's handball arena in southeastern Seoul on August 5, member Yeri likened the melody to the tune of a Tetris game, stating that she "thought it's exactly the song you should listen to in summer" since it is "energizing and can play in the background for driving".

Meanwhile, member Wendy compared it to their first summer single "Red Flavor" which was released in 2017 and admitted she "wasn't very impressed at first" but added "the more I listened to the song, the more energy of a different sort it gave me".

[9] The EP contains six other tracks, including an English version of "Bad Boy" which the group previously performed for the first time at KCON 2018 in New York in June of the same year.

[10] Claire Chung of Haps Magazine characterized the second track "With You" as an R&B song underlaid by trendy reggae synth pluck sounds with a moombahton rhythm.

"Blue Lemonade" is an urban pop dance song featuring a rhythmic synth base and bubbly background sounds.

[11] To promote the EP, a series of image teasers were released on July 29, 2018, through the group's official social media accounts.

Hong Dam-young of The Korea Herald opined that the EP proved that Red Velvet "does not linger in the past, but instead takes itself to the next level".

[11] Seung Park of Kotaku remarked that the group "stepped up to fill a sorely-needed niche in k-pop" and called Red Velvet "Orange Caramel's spiritual successors as the resident purveyors of the quirky and weird".