The two have lent their voices for the song "My Darling", which serves as Part 6 of the hitmaker's on-going anniversary project. The song is a medium tempo R&B pop ballad that expresses the differing feelings between a long-term relationship winding down vs. starting off a new one. 

SEE ALSO: PINK BnN (A Pink's Bomi & Namjoo) sing 'My Darling' for Brave Brothers' 10th anniversary project

The girls explain once again what the song is about and what kind of song it is. The girls sing a bit of the song themselves, and talk about how it felt working with Brave Brothers for the first time.

Check out the video above, and check out the making-film from the recording below!