Singer John Park released the teaser for his new single "U."

On September 12, John Park will reveal his new song "U," which is a new song since his album INNER CHILD from July 2013.

In the teaser, John Park showed his changed looks and upgraded image.

John Park worked on his new song with the producer who worked with Justin Bieber on the song, "One less lonely girl."

In response to his teaser, people said, "John Park, is this finally a manly concept?", "Something changed about John Park", and "I'm looking forward to his comeback."