The duo has revealed a concept teaser for their upcoming full album called "SAILING."

The next scene shows Chan Hyuk raising and hoisting the mainsail, while Su Hyun watches him. The clip then cuts and presents the siblings set sail across the ocean. Su Hyun is the one steering the wheel, while Chan Hyuk comfortably sits on the vessel. Chan Hyuk can then be heard singing a few lines before the clip concluded.

This comeback is believed to be more mature than their previous tracks and albums as both of the siblings have now become adults. Chan Hyuk said in an interview after he was discharged from the military earlier on the 29th of May, "Su Hyun turned into an adult while I was serving in the military, so I think a more mature and full album will be produced."

Previously, Akdong Musician unveiled a teaser poster for their new album. The duo sits on a wooden platform near the sea. Su Hyun is dressed in a fancy orange outfit while Chan Hyuk wears a simple black and white sweater.

In addition, a video teaser, which features Lee Su Hyun's beautiful vocals, has been released ahead of the concept teaser. The clip gives the fans an idea of what to expect from their nearing return in the music industry as a duo. In the video, the waves crashing on the shore harmonize with Su Hyun's voice, setting up the mood that people will hear in their next album.

"Sailing" is a long-awaited comeback of Akdong Musician, as the duo has been hiatus for two years since Chan Hyuk began to serve in the military on September 18, 2017. Their last album before Chan Hyuk's enlistment is called "Summer Episode," which was released on July 20, 2017. It consists of only two tracks: "Dinosaur" and "My Darling."

"Dinosaur" is the duo's first time to experiment with the well-known EDM genre, while "My Darling" features an acoustic guitar and charming melody.

"Sailing" is scheduled to be out on September 25.

Stay tuned for more teasers and details about Akdong Musician's upcoming comeback.