On September 19 at midnight KST, Dowoon released track information for his upcoming debut digital single 'Suddenly,' a duet with Song Heejin. The album will include two versions of the song "Suddenly". He also relayed a message, "The thought I suddenly had while walking on the street. When did I become me?"
Dowoon's solo debut digital single will be released on September 27 at 6 PM KST.