Instagram/Lili Reinhart & RM & Jin Music Lili Reinhart stars in BTS's "Swim" music video. See the global K-pop icons and the actress in a cinematic nautical adventure filmed in Lisbon. March 20, 2026 AceShowbiz - Lili Reinhart features prominently in the latest music video for the global K-pop sensation BTS and their single "Swim," the lead track from their much-anticipated fifth studio album Arirang. The collaboration marks a striking moment as Lili Reinhart, best known for her acting career, joins forces with the seven-member group comprising RM, Jin, Suga, J-Hope, Jimin, V, and Jungkook.