South Korean singer Sung Si-kyung has released a duet with Indonesian artist Raisa titled "Heaven Knows." The song was made available on various music platforms at 6 PM KST on Tuesday. This collaboration marks a significant musical exchange between the two artists and their respective fan bases. Details regarding the song's creation and inspiration have not been widely publicized, but it is anticipated to appeal to fans of both artists’ signature ballad styles. The release is expected to broaden Sung Si-kyung’s international reach and introduce Raisa to a Korean audience. The duet is already generating buzz on social media among fans eager to hear the combined talents of the two singers.