Both acts confirmed the duet on X.
Packed with key figures in the K-pop industry, the event celebrated the launch of Billboard Korea.
The project will showcase the K-pop star's evolution as a solo artist.
"We were very prudent with each and every decision," MARK tells Billboard.
The K-pop star said she cried when she learned she'd been cast in the HBO drama filming in her native Thailand.
The six-minute clip opens with the BTS star singing his solo track with his band on a roof before night falls and his special guest pops in.
The letter came in the midst of the ongoing dispute between ADOR & parent company HYBE.
The outing will be the follow-up to the group's 2023-2024 "Follow" tour of Asia.
The project features seven tracks.
The 2024 festival takes place in Los Angeles.
