Wonho is gearing up to make a comeback!

On September 5 KST, the solo artist released a third and final batch of concept photos promoting his upcoming second mini album 'Blue Letter.' In the images, the idol appears both casual and masculine as he poses in both indoor and outdoor settings. Following the concept image releases, the next teaser Wonho will be releasing is the album's official tracklist on September 6.

Meanwhile, 'Blue Letter' is set for release on September 14.

Check out the concept images below!