Jung Kook‘s “3D” promotion at Global Citizen Festival didn’t remain cryptic for long. BIGHIT Music confirmed Saturday night (Sept. 23) that “3D” is Jung Kook’s second solo single — and it features Jack Harlow.

“We are excited to announce the release of BTS member Jung Kook’s digital single ‘3D (feat. Jack Harlow),’” BIGHIT revealed.

The details, as written in an official note on the fan community platform Weverse: “Jung Kook’s second solo single, ‘3D (feat. Jack Harlow),’ is a Pop R&B track with clever expressions of feelings toward an unattainable person from the perspectives of first, second, and third dimensions. Get ready to meet an even more mature side of Jung Kook following ‘Seven (feat. Latto).’ Jack Harlow has featured in this track, bringing his unique rap style and adding zest to the song.”

Jung Kook and Harlow’s “3D” will be released on Friday, Sept. 29 at 1 p.m. KST/12 a.m. EST. The song follows his July release of his single “Seven” feat. Latto, which debuted at No. 1 on the Billboard Hot 100.

“I’ll fly u from Korea to Kentucky,” Harlow tweeted earlier on Saturday, hours before the news of “3D” hit. Is this a lyric from the new collab? Fans will find out on Friday.

As Jung Kook’s performance ended at Global Citizen Fest in New York City Saturday evening, a then-cryptic clip played on a large screen on the stage, showing “Jung Kook” and “3D.”

When BIGHIT unveiled what exactly “3D” is after the show, the reveal also came with “hero film” teasers. See parts one and two below.