Seohyun of famed K-pop girl group Girls’ Generation has collaborated with a North Korean art troupe to sing about unification and peace.

Seohyun made a surprise appearance during the grand finale of North Korea’s Samjiyon Orchestra’s concert. The orchestra held a special concert celebrating the 2018 PyeongChang Winter Games on Sunday.

The 140-member Samjiyon Orchestra is led by Hyon Song-wol, head of the all-female Moranbong Band. Seohyun performed “Let’s Meet Again” and “Our Wish is Unification” with a female octet from the North Korean art troupe.