Cube Entertainment has informed allkpop that 4minute's HyunA, who's currently slated for a July 5th solo comeback with "Bubble Pop!", will be releasing a sweet ballad featuring labelmates Junhyung and G.NA ahead of the album's official release! On June 30th, she'll be releasing the only ballad off of her album, "A Bitter Day", featuring the help of her labelmates for an impressive combination of emotional singing and rapping. HyunA's already had her skills acknowledged as a solo singer with her "Change" debut back in 2009, so fans are expecting nothing less with her return.�They have quite the treat awaiting them, as rapper Dok2 has also been named as one of the guest features in "Bubble Pop!" Stay tuned to allkpop for its release, and check out her album jacket photos if you haven't already.