The preview shows Halsey complete her shift at the ticket booth of a movie theater. She walks out to see BTS sitting on a couch outside the Persona theater.
"#BTS <(Boy With Luv) feat. Halsey> Official Teaser 1," BTS' agency, Big Hit Entertainment, tweeted Sunday.
Halsey also promoted the video in a tweet on her own account.
"showtime baby @bts_bighit + halsey #boywithluv," she wrote.
"Boy with Luv" appears on BTS' forthcoming album Map of the Soul: Persona. The full music video and the album both debut Friday.
BTS shared plans and a teaser for Map of the Soul: Persona in March. The album is a followup to Love Yourself: Answer, the third and final installment in the group's Love Yourself album series.