SEE ALSO: BTOB announces solo concert 'This Is Us'
The two BTOB members' new song is part of music production company CELF Company's compilation album 'CLEF Project 4/4'. It's 1 of 9 songs on the album, which also includes artists like PALOALTO, Youngjun of Brown Eyed Soul, Kang Gyun Sung, and Lee Ji Young of Big Mama.
Check out "My Day" above! How do you like Eunkwang and Changsub's duet?