AKMU's second portrait poster with a lonely autumn flavor was unveiled.

YG Entertainment posted the teaser poster for Akmu's third full-length album "SAILING" on its official blog at 10 a.m. on Sept. 10.

In the teaser poster, Lee Chan-hyuk and Lee Soo-Hyun sit back and forth against the backdrop of a boulevard with a lonesome autumn atmosphere Lee Soo-Hyun's poor look further redoubled the lonely mood of the bustle.

The horizontal poster format, which is made as if a white canvas was painted with blue paint, is also drawing attention.

AKMU will release its third full-length album, "SAILING," at 6 p.m. on Sept. 25. It is the first album in about two years and two months since "SUMMER EPISODE" released in July 2017. The full-length album is expected by fans as it will present the musical world of Akmuman.

Earlier, a 'SAILING' mood teaser with the lyrics 'Close your eyes and feel the waves in your ears/ I' am gonna sit still and I know how to sail' was also unveiled. More mature music can be detected through mood teasers and poster teasers produced under the theme of "SAILING."

AKMU spent a two-year hiatus following Lee's military service. During the period, Lee served as a judge for JTBC's "Super Band" and has been working extensively as a YouTuber.

AKMU was loved for its witty lyrics, such as "200%," "Give Love," "Last Goodbye" and "DINOSAUR," as well as songs of melodies that one cannot forget once heard. Attention is focusing on what kind of music AKMU will perform through its third full-length album, "SAILING.