MAMAMOO's Moon Byul released the concept photo for "Selfish" feat. Red Velvet's Seulgi.

Last month, the two idol stars, who became close through 'Idol Drama Operation Team', have been captured filming an MV together for Moon Byul's solo album.

Finally, they are getting ready to reveal their long-awaited collaboration track "Selfish". In the first concept photo, the two took on a cute sporty look in matching outfits.

The full release of 'Selfish' is coming on May 23. How excited are you for the collab?