Almost 10 years after their debut, I.O.I returns with an emotional track, Suddenly, from their reunion album I.O.I: LOOP. We break down the music video details, including Somi's viral kissing of Doyeon!

I.O.I is finally back after nine years, but it is their shocking teaser moment featuring Jeon Somi and Kim Doyeon that has taken over the internet. Here is everything about their comeback, concept, members, and why it is going viral.

Returning after a 9-year hiatus, the project group formed from the television show Produce 101 is back for a mini-album and an Asia tour! We have all the details on I.O.I's revamped comeback image, album, and tour details!