APink's sub-unit group 'Pink BnN' release audio teaser

After announcing that 'Pink BnN' is APink first unit group, fans have been anticipating their future activities as well as who the members would be in.

In regards to that, an audio teaser is released today to give fans hint which members are singing. Fans throw their guesses that it would be a duo sub-unit with members Bomi and Namjoo, while others say it could Bomi and Na Eun. How about a trio of them?

Let's wait for further revelation on 28th. So what's your guess? Listen below: