Teenfresh

On July 24, 2023, High Up Entertainment announced STAYC would be releasing their third extended play titled Teenfresh on August 16. A day later, the promotional schedule was released. It was also announced that "Bubble" would serve as the lead single. On August 9, the first music video teaser for "Bubble" was released. Five days later, the highlight medley teaser video was released. On August 15, the second music video teaser for "Bubble" was released. The extended play was released alongside the music video for "Bubble" on August 16.

Teenfresh contain six tracks. The lead single "Bubble" was described as a bubblegum pop song with lyrics having the message that "we tend to trap ourselves in the bubbles of criticism and unrealistic expectations". The second track, "Not Like You", was described as a hip hop song with lyrics about "the liberation that self-love and confidence brings". The third track, "I Wanna Do", was described as a "mid-tempo" R&B song with lyrics that "growing up may be hard, unforgiving, cruel and lonely, but one will always find a home in companionship". The fourth track, "Be Mine", was described as a "Y2K-inspired" R&B song.

Teenfresh debuted at number three on South Korea's Circle Album Chart in the chart issue dated August 13-19, 2023.

Prior to the release of Teenfresh, on August 16, 2023, the group held a live event to introduce the extended play and its songs, and to communicate with their fans. The group are also scheduled to hold their first concert tour titled Teenfresh as part of the extended play's promotion from September 23, 2023, to February 16, 2024.