Spoiler teaser for boy band ONF U has been opened.

ONF U posted a spoiler teaser image and a receipt teaser for its fourth mini album "GO LIVE" on its official SNS of WM Entertainment at midnight on Sept. 26.

In a black-and-white teaser image released, U reveals the side features hidden in a mask, creating a mysterious atmosphere. The small image cut features a close-up of a scarred eye looking down and offers a chic and subtle charm. And the handwritten phrase”gallery. Where” and design drawings are fueling questions about the upcoming storytelling.

ONF's fourth mini album "GO LIVE" features a total of five tracks, including the title track "WHY," as well as “Asteroid” and “ALL Day”. It is produced by Monotree, raising questions about whether it will create another masterpiece with its deeper music color and higher quality music.

Since its debut, it has garnered expectations from music fans with its unique concept and signature-like MV, which is composed of ONF teams, and its unique musical sensibility and solid planning.

The fans are increasingly curious about the secrets of natural relationships and all-time storytelling, which has been hidden in the teaser since last month by releasing episodes of worldviews.

ONF's fourth mini album "GO LIVE" will be released on various music sites at 6 p.m. on Oct. 7.