I.O.I has released a teaser for the music video of their new song "Suddenly" to celebrate their 10th debut anniversary.

On the 6th at midnight, I.O.I (Lim Nayoung, Chungha, Kim Sejeong, Jung Chaeyeon, Kim Sohye, Yoo Yeonjung, Choi Yoojung, Kim Doyeon, Jeon Somi) unveiled the teaser video for the title track "Suddenly" from their third mini-album I.O.I : LOOP on their official social media channels. The teaser begins with Jeon Somi approaching Kim Doyeon and unexpectedly kissing her. This is followed by Kim Doyeon's surprised reaction as she sits down, leaving a strong impression despite the short length of the video.

The title track "Suddenly" is a synth-pop song that delicately portrays waves of sudden longing. Jeon Somi participated in writing the lyrics, conveying sincerity about the time they have spent together and the tender feelings of rekindled relationships. The song features repetitive lyrics and a dreamy outro sound.

Swing Entertainment explained that members directly participated in writing and composing several tracks on the mini-album I.O.I : LOOP, showcasing their musical abilities.

I.O.I will release their third mini-album I.O.I : LOOP on the 19th at 6 PM through various online music platforms. Following this, they will hold their Asia tour LOOP for three days from the 29th to the 31st at the Jamsil Indoor Gymnasium in Songpa-gu, Seoul.