The K-pop supergroup BTS has taken up a week-long residency on "The Tonight Show." It kicked off Monday night on NBC.Fallon opened Monday's BTS Week show with his usual monologue. Members of BTS RM, Jin, Suga, J-Hope, Jimin, V and Jungkook materialized after about 15 minutes, performing a pre-taped version of "Dynamite" alongside Fallon and his house band, The Roots.
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