In March 2015, Esna and Seulong released the song "Destiny", for the soundtrack of the television drama "Hogu's Love". It was written and produced by Esna, and was the main theme for Seulong's character in the drama. In April, Esna and Mamamoo released the collaboration single "Ahh Oop!", from Mamamoo's album "Pink Funky". The song was written by Esna, with lyrics telling men to stop using cliché pick-up lines and treat women with respect. It was promoted on music shows for two weeks and had an accompanying music video produced and directed by Digipedi. After the song's release, Esna received derisive comments about her appearance from Korean netizens. She then released a remake of the song, titled "Ahh Shit!", which includes the lyrics "All my ladies out there, you’re beautiful just the way you are". The remake received a positive review, and Esna stated that she wants to change the image-focused nature of K-pop. On October 22, 2015, Esna released her first extended play, "eSNa The Singer". It contains the previously released single "A Little Lovin" and a solo version of "Ahh Oop!", as well as the single "Me, Today". "Me, Today" features San E on the Korean version of the song, and Flowsik on the English version. Esna held a "listening party" at the D Bridge club in Cheongdam-dong to celebrate the album's release. In April 2016, Esna became the DJ for the Arirang Radio program "Sound K".