NMIXX is set to return with a fresh musical synergy, teaming up with singer-songwriter Hanroro.

The group will release their 5th mini album "Heavy Serenade" on May 11, marking their first comeback in about seven months since "Blue Valentine" last October.

The tracklist has been unveiled. The album features six tracks: the title track "Heavy Serenade," along with "Crescendo," "Idolbit," "Different Girl," "Superior," and "Loud."

The collaboration is drawing attention. Hanroro wrote the lyrics for the title track, while members Lily and BAE also participated in songwriting for tracks 1, 6, and 4.

Ahead of the official release, NMIXX will preview new songs. They are scheduled to perform "Superior" at an e-sports festival pre-event on April 24 and release the music video for "Crescendo" on April 28.