Heejun has dropped the first teaser for his highly anticipated duet track with Girls' Generation's Tiffany!

He and Tiffany showed off their chemistry earlier through a Q&A session to go along with the theme of their song "QnA". Now we get to hear their vocal chemistry in action through this audio snippet of their song!

It sounds like a delightful tune for the warm spring season, so make sure to check back for its release on May 15!