갑자기 (Suddenly)

“Suddenly” (갑자기) is the title track of I.O.I’s third extended play, I.O.I: Loop, released on May 19, 2026 via SWING Entertainment — marking the group’s long-awaited reunion to celebrate their 10th debut anniversary. Composed by VVN, KUSH, and IDO, and co-written by member Jeon Somi alongside VVN, the synth-pop track delicately expresses waves of longing and memories that surge unexpectedly — a perfect metaphor for the group’s own decade-long hiatus. Nine of the eleven original members reunited for the EP, which was announced on Christmas Day 2025 and produced over several months as an anniversary project.

I.O.I’s 10th anniversary reunion became one of the most emotionally significant moments in recent K-Pop history, reuniting nine members who had separately built careers in groups like BLACKPINK (Jisoo was not part of this group, but Yoojung, Doyeon, and others returned), Weki Meki, Pristin, and as soloists. The announcement on Christmas 2025 generated immediate global media coverage, and “Suddenly” — thematically rooted in unexpected resurfacing of buried feelings — captured the exact emotional weight of the reunion itself. The EP’s prior lead single “Goodbye with a Smile” and the title track “Suddenly” both charted strongly in South Korea, with the release resonating deeply with fans who have followed the members’ individual journeys for a decade.

어쩌면 잘된 일이야, 빨간 노을빛처럼 (Maybe it was for the best, like the red glow of the sunset.)
예쁜 널 보내야 했던 그때가 (The moment I had to let your beautiful self go.)
머나먼 희미한 기억 (A distant, fading memory.)
이젠 내 맘속 널 지워야 하나? (Should I erase you from my heart now?)
자려고 누웠는데 갑자기 너에 대한 생각에 잠겨 (I lay down to sleep, but suddenly found myself lost in thoughts of you.)
별처럼 감정들이 쏟아져 (In the midnight, emotions pour down like stars.)
Oh, 갑자기 너에 대한 그리움에 사무쳐 (Oh, suddenly I’m overwhelmed by longing for you.)