Previously, Crucial Star featured in JYJ Junsu's 4th full album 'Fun Drive', so it looks like this time, Junsu will be lending his voice for Crucial Star's new track. In the preview clip, Junsu's soulful voice floating over a comfortable, mellow beat catches our attention.

SEE ALSO: Junsu (XIA) returns to public TV after 15 years on 'Superman Returns', announces encore concert

You can listen to the full release on October 8!