Mamamoo worked with a number of musicians prior to their formal debut. Their first collaboration, "Don't Be Happy" was released in 2014. What famous R&B singer is featured in the song?

"Don't Be Happy" is a collaborative track by Mamamoo and Bumkey taken from the extended play Hello. The song is about missing someone and begging them not to be happy with someone else.

Asked by Vasilii Kulev · Last updated 5 years ago · 202 views · SOURCE