“Suddenly” is the title track of I.O.I’s third mini-album, I.O.I: LOOP, released to celebrate their 10th debut anniversary. It is a synth-pop song that delicately expresses waves of longing and memories that surge unexpectedly. Member Jeon Somi co-wrote the lyrics.

Song Credits

  • Artist: Suddenly
  • Album: I.O.I: LOOP
  • Released: May 19, 2026
  • Length: 3:15
  • Label: SWING Entertainment
  • Composer: VVN, KUSH (쿠시) & IDO (KOR)
  • Lyricist: JEON SOMI (전소미) & VVN

I.O.I “Suddenly” Official MV

I.O.I “Suddenly” Lyrics

Hangul

어쩌면 잘된 일이야
빨간 노을빛처럼
예쁜 널 보내야 했던 그때가

머나먼 희미한 기억
이젠 내 맘속 널 지워야 하나

자려고 누웠는데 갑자기
너에 대한 생각에 잠겨
In the midnight 별처럼 감정들이 쏟아져
Ooh 갑자기 너에 대한 그리움에 사무쳐
Till the morning
그렇게 아침이 밝아오네
잊으려 누웠는데

막혀 있는 도로 위
수많은 차 중 하나
내 마음 알아주던 너는 어디 있을까

머나먼 희미한 기억
이젠 내 맘속 널 지워야 하나

자려고 누웠는데 갑자기
너에 대한 생각에 잠겨
In the midnight 별처럼 감정들이 쏟아져
Ooh 갑자기 너에 대한 그리움에 사무쳐
Till the morning
그렇게 아침이 밝아오네
잊은 줄 알았는데

아무리 애써도
괜찮은 척해 봐도
잊을 만하면 또 드리워지는 기억
우리 추억들
자꾸만 아른아른거리잖아

La-la-la, la-la-la, la-la-la-la, la-la
La-la-la, la-la-la, la-la-la-la, la-la
Ooh, la-la-la, la-la-la, la-la-la-la, la-la
La-la-la, la-la-la, la-la-la-la, la-la
너 뭔데 갑자기

Romanized

Eojjeomyeon jaldoen iriya
Ppalgan noeulbitchoreom
Yeoppun neol bonaeya haetdon geuttaega

Meonameon huimihan gieok
Ijen nae mamsok neol jiwoya hana

Jaryeogo nuwonneunde gapjagi
Neoe daehan saenggake jamgyeo
In the midnight byeolcheoreom gamjeongdeuri ssodajyeo
Ooh gapjagi neoe daehan geuriume samuchyeo
Till the morning
Geureotge achimi bargaone
Ijeryeo nuwonneunde

Makhyeo inneun doro wi
Sumanheun cha jung hana
Nae maeum arajudeon neoneun eodi isseulka

Meonameon huimihan gieok
Ijen nae mamsok neol jiwoya hana

Jaryeogo nuwonneunde gapjagi
Neoe daehan saenggake jamgyeo
In the midnight byeolcheoreom gamjeongdeuri ssodajyeo
Ooh gapjagi neoe daehan geuriume samuchyeo
Till the morning
Geureotge achimi bargaone
Ijeun jul aranneunde

Amuri aesseodo
Gwaenchanheun cheokhae bado
Ijeul manhamyeon tto deuriwojineun gieok
Uri chueokdeul
Jakuman areun-areungeorijana

La-la-la, la-la-la, la-la-la-la, la-la
La-la-la, la-la-la, la-la-la-la, la-la
Ooh, la-la-la, la-la-la, la-la-la-la, la-la
La-la-la, la-la-la, la-la-la-la, la-la
Neo mwonde gapjagi

Translation

Maybe it’s for the best
That moment back then when I had to let you go
You, who were as beautiful as a crimson sunset

A distant, faint memory
Should I erase you from my heart now?

I lay down to sleep, but suddenly
I’m immersed in thoughts of you
In the midnight, emotions pour down like stars
Ooh, suddenly I’m overcome with a deep longing for you
Till the morning
Just like that, the morning dawns
Even though I lay down to forget

On top of this blocked, congested road
I’m just one of the countless cars
Where are you now, the one who used to understand my heart?

A distant, faint memory
Should I erase you from my heart now?

I lay down to sleep, but suddenly
I’m immersed in thoughts of you
In the midnight, emotions pour down like stars
Ooh, suddenly I’m overcome with a deep longing for you
Till the morning
Just like that, the morning dawns
Even though I thought I forgot

No matter how hard I try
No matter how much I pretend to be okay
Just when I’m about to forget, the memories cast a shadow again
Our memories
They just keep flickering before my eyes

La-la-la, la-la-la, la-la-la-la, la-la
La-la-la, la-la-la, la-la-la-la, la-la
Ooh, la-la-la, la-la-la, la-la-la-la, la-la
La-la-la, la-la-la, la-la-la-la, la-la
Who do you think you are, appearing so suddenly?

I.O.I “Suddenly” Meaning

“Suddenly” (갑자기) by I.O.I is a sentimental synth-pop song about memories and emotions that unexpectedly return after a long time apart. Released for the group’s 10th debut anniversary, the track captures the bittersweet feeling of reunion and nostalgia.

The title “Suddenly” reflects how past memories and feelings can reappear without warning in everyday life. The lyrics describe waves of longing that suddenly flood back, reminding the narrator of precious moments shared in the past.

The song also represents the emotional reunion between I.O.I and their fans after many years apart. Rather than focusing only on sadness, the track balances nostalgia with warmth and gratitude, celebrating the bond that still remains despite the passage of time.

Co-written by Jeon Somi, “Suddenly” ultimately becomes a heartfelt message about cherishing memories, reconnecting with people you once loved, and realizing that meaningful feelings never truly disappear.