Singers The One and Sonnet Son released a duet song on June 19.

The One and Sonnet Son released the song "Wistful" through online stores, aiming to rise on the top of duet records. The One and Sonnet Son's duet project was held so that collaboration of skilled artists could take place.

The One has previously risen to the top on MBC's survival program "I am a Singer: Season 2" while Sonnet Son claimed the prize on Mnet's "Voice of Korea: Season 1".

Producer K Story Entertainment stated: "We began this project in hopes that talented musicians would work together to create quality music; the staff and the artists are all very satisfied with our final result."

"Wistful" sings about the unrequited love and the wistfulness experienced by the lovers. The two singers' beautiful voices create a harmonious music pleasing to the ears.

Previously, the two have appeared on KBS "Legend Song" on June 13, taking the prize with a stage of Lee Chi Hyun's "Please Tell Me You Love Me".