I.O.I revealed the tracklist for their third mini-album, 'I.O.I : LOOP,' at midnight on the 27th through their official SNS channels. All members, including Lim Nayoung, Chungha, Kim Sejeong, Jung Chaeyeon, Kim Sohye, Yoo Yeonjung, Choi Yoojung, Kim Doyeon, and Jeon Somi, participated in this album.

The released tracklist image contains credits for a total of six songs, and this album captures moments when emotions that had been stagnant for the past decade reconnect. The title track, "Suddenly," is a synth-pop genre song, with lyrics co-written by member Jeon Somi. The song expresses sudden waves of longing without warning and reflects the tender feelings of relationships reunited.

Members' participation is prominent in the production of the included songs. Jeon Somi contributed to the lyrics of the pop dance track "IOI (Where My Girls At)," Yoo Yeonjung worked on the rock-sound song "IF I," and Chungha participated in the ballad track "Back Then, Us Now." "Back Then, Us Now" continues the narrative from their previous release, "Sonagi."

Additionally, the album includes "SPF 100+ (Summer Pop Fantasy)," an Afrobeats genre track that adds energy to the album. The final track, "Goodbye with a Smile," was produced by Jinyoung and features archived vocals recorded by the members in 2016.

I.O.I will preview their comeback excitement with a pre-release single on May 4 and will release their third mini-album on May 19 at 6 PM. Following this, they will hold a solo concert marking the start of their Asia tour at the Jamsil Indoor Gymnasium in Seoul from May 29 to 31.