NiziU is making their Korean comeback official. The group announced on September 7 at midnight KST that their first Korean mini album, Sour Grapes, will drop on September 28 at 6 p.m. KST.

The announcement came with a prologue film that sets an intense tone for the project. NiziU, the Japanese-Korean girl group under JYP Entertainment, has been building momentum in both Japan and South Korea since their debut. This marks a significant push into the Korean market with a dedicated Korean-language release.

The September 28 release date gives fans about three weeks to prepare. With the prologue film already generating buzz, NiziU is ramping up anticipation ahead of the full album rollout. The group is expected to share more details in the coming weeks—likely including the title track, tracklist, and any music video teasers.

NiziU debuted in 2020 through a survival show and has since built a solid fanbase across Asia. Their mix of Japanese and Korean members has given them a natural bridge between markets, and this dedicated Korean mini album signals JYP's commitment to establishing them as a force in the K-pop space as well.