MONSTA X hit the stage for the Jingle Ball Tour at Wells Fargo Center, Philadelphia on Dec. 13 ( U.S. Time). They performed several songs including ‘Whispers in the Dark’ from their second full-length U.S. album "The Dreaming.” These photos, provided by Starship Entertainment, show MONSTA X. (PHOTO NOT FOR SALE) (Yonhap)

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