'ARIRANG': BTS release first music video 'Swim'; K-Pop stars hit the high sea with Lili Reinhart

K-pop megastars BTS have officially made their big return with the release of their fifth studio album 'ARIRANG' on Friday. After keeping fans waitting for almost four-years, the boys surprised fans with their first music video starring Hollywood actress Lili Reinhart, best known for her work in the 'Riverdale' series. Directed by Tanu Muino the music video feaures RM, Jin, Suga, j-hope, Jimin, V and Jung Kook setting sail on the high seas. While the boys take the ropes and wheel as they navigate the high seas, Lili puts up a moving contemporary dance performance. Much like 'Butter' and 'Permission to Dance', 'Swim' is an English landuage song featruing haunting verses and a rap by RM. Along with the released of the vide, Lili took to her handle to share a behind the scenes clip and say, "Keep an eye on them for me, thanks."Making up for their absence, the new BTS album, features a track list of 14 songs. This album is named after a Korean folk song and is billed as reflecting the seven-member boy band's roots and identity. The album launch comes just a day ahead of their open-air comeback concert in the heart of Seoul. The Saturday night gig, which is expected to draw around 260,000 people, will be BTS's first after a hiatus of almost four years while all seven members served compulsory military service. It comes ahead of an 82-date world tour."We gave deep thought to our identity -- and how best to express ourselves authentically -- across the entirety of our music and performances," BTS member Jimin, 30, said ahead of the release of the group's album, their fifth studio release."As an extension of that process, we also revisited the significance of our background as a group comprised entirely of Korean members," he said in a statement.Beginning with "Body to Body" and ending with "Into the Sun", the 14-track "ARIRANG" album takes its name from a folk song about longing and separation that is often dubbed South Korea's unofficial national anthem.