Yona's music composer, Kunihiko Ryo, is a ethnic Korean raised in Japan. Under his Korean name Yang Bang-ean, he's done quite a few music contributions for Korea's music.
One of his composing acheivements is his rendition of Korean folk song Arirang, performed at the inauguration ceremony of South Korean President Park Geun-Hye in 2013.
He also performed his rendition at the handover segment of this year's Winter Olympics closing ceremony in Sochi, Russia, to mark Pyeongchang as the 2018 hosts.
(Kunihiko's playing the piano. The singers are jazz singer Na Yoon Sun(in red) and soprano Jo Soo Mi(in white)).
Move to 00.55 for performance start: