Huh Gak and A-Pink's Eunji will release a duet song on May 31.

The new song, titled "A-Cube For Season: Blue," will be a follow-up tune to their management company A-Cube's previous For Season series. 'Green' was done by Eunji and BEAST's Yoseob, and 'White' was performed by BEAST's Jang Hyun Seung and A-Pink's Eunji and Kim Nam Joo.

Huh Gak and Eunji have previously paired up back in February for Huh Gak's first album Little Giant when the A-Pink member featured in "Because We Know We Are Breaking Up."

A-Cube stated, "Huh Gak and Eunji's duet song was received very well last time, so we wanted to create some synergistic effects again."

Meanwhile, Huh Gak appeared on 'Immortal Songs' on May 25. 'Immortal Songs' invites prominent artists to perform a song by legendary Korean artists and selects winners among participants. He performed "Western Sky" and received a positive review from Lee Seung Chul, the original performer of the song.