Kim Junsu held his three-day concert, ‘Dimension Concert in Seoul,’ to celebrate the release of his 3rd mini-album ‘Dimension.’ After Hyolyn's and Junsu's performance on Double Trouble, which they also won, they became friends. Hyolyn made a special appearance on all three days and performed the ‘Adult ceremony’ and her song 'blue moon.' At Hyolyn’s request, they also performed the hit song 'Timeless' (original by Junsu and Zhang Liyin). It’s the first time in 16 years for Junsu to perform this song live.

Adult ceremony (original by Park Jiyoon):

Timeless:

Fans are loving the interaction and can’t wait to see Hyolyn on Queendom 2 and Junsu in his musical Death Note.