C-JeS Entertainment confirmed the collaboration, announcing, "Yoon Do Hyun participated in Jaejoong's 1st full-length album. Jaejoong always wanted to collaborate with Yoon Do Hyun, a sunbae who he respects, for a song on his album, which is of the rock genre, so Yoon Do Hyun willingly accepted, leading to their collaboration. Not only Yoon Do Hyun but various artists participated in Jaejoong's album as well. Fans will also probably be surprised."
Jaejoong will continue to get fans ready for his album release later this month with a teaser image on October 14 and a pre-release track on the 15th! In the meantime, check out Jaejoong and Yoon Do Hyun in the studio below!