South Korean singer Seo Hyun (C) sings the song, "Our Wish Is Unification," with singers of North Korea's Samjiyon Orchestra, during a concert by the North Korean art troupe at the National Theater of Korea in Seoul on Feb. 11, 2018. The art troupe visited South Korea to celebrate the PyeongChang Winter Olympics, which is under way in the northeastern alpine town of PyeongChang. (Yonhap) (END)