In what year was the album “Mainstream - Single” released by BE:FIRST?

In what year was the album “Mainstream - Single” released by BE:FIRST?: The album “Mainstream - Single” was released in 2023 by BE:FIRST, featuring 3 tracks.
What is the most successful song from the album “Mainstream - Single” by BE:FIRST?: “Mainstream” is the biggest hit from the album “Mainstream - Single” by BE:FIRST.

Other artists of Asiatic music