앰퍼샌드원 (AMPERS&ONE) 'Broken Heart' Performance MV K-POP Wonderland, 1theK K-POP의 모든 즐거움을 1theK(원더케이)에서 만나보세요! :) Welcome to the official YouTube channel of K-POP Wonderland, 1theK '1theK Live' Subscrib…