It has been reported that BTS and The Chainsmokers worked together for the upcoming comeback album.
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According to Big Hit Entertainment, BTS and The Chainsmokers worked on a track called "Best of Me" together. The two groups first met at the '2017 Billboard Music Awards' back in May this year. Afterward, it appears that they consistently worked up something special together for the fans and it finally paid off as the fans will get the chance to listen to "Best of Me" soon.