4minute's HyunA has proven herself to have a knack for looking unintentionally sexy once again.

On the morning of April 10th, HyunA tweeted, "Ah mental breakdown," along with the above photos.

HyunA is wearing a simple outfit, a white long-sleeved shirt and simple black shorts, yet the young star still manages to exude a sexy vibe. She drew laughter from Twitter followers�with close-ups of various expressions of her "mental breakdown".

Fans commented, "Even her mental breakdown is sexy," "4minute's new album is 'daebak'," and "Seems like there's a lot of stress because of the comeback."

High expectations have built up around 4minute's upcoming comeback after the release of their title song "Volume Up". The track rose to first on various music sites soon after its release on April 9th.

Source+Picture: HyunA'sTwitter