After 2 members of Super Junior Kyu Hyun and Ryeo Wook contributed on TVXQ's Mirotic album song "Wish" with Choi Kang Chang Min and Xiah Jun Su, Xiah Jun Su somewhat showed an interest to be a part of Super Junior's sub-unit by dealing it as a joke. "KRY of Super Junior really got the pitch that I personally adore. TVXQ has five members so there is no chance to form a sub-unit. I want to be a part of KRY not SJ-Happy with Eun Hyuk."
TVXQ members are confident and grateful for Kyu Hyun and Ryeo Wook's contribution to their album and a sure support from Cassiopeia plus ELF.
TVXQ wishes Super Junior's 3rd album to release soon which is currently being polished.