HyunA Poses in Bra & Underwear in Trouble Maker Comeback Photo

Trouble Maker

CUBE Entertainment. INC

PSY's "Gangnam Style" co-star joins up with Beast member Hyunseung for a new single as the Trouble Maker duo.

Months before HyunA gained international awareness after starring in PSY's "Gangnam Style" video, the singer/rapper had risen to K-pop stardom as a member of girl group 4minute, for her solo work and for a successful duo project called "Trouble Maker." As Trouble Maker, the starlet teamed up with a member of boy band Beast, Hyunseung, for a four-track EP in late 2011. The album's lead single "Trouble Maker" was an infectious, whistle-laden pop duet that spent six weeks in the Top 5 of the K-Pop Hot 100, peaking at No. 2.

Despite no activitiy in 2012, HyunA and Hyunseung are back for a new project -- and, boy, does it look sexy.

A teaser video featuring Trouble Maker was released late at night on Oct. 22, revealing a newly-blonde HyunA sitting between her musical partner's legs. While the Beast boy appears coveerd up in a traditional suit, HyunA's shirt and jacket are popped open revealing super-sexy black undergarments.

CUBE Entertainment, Trouble Maker's label, tweeted a full photo of the duo early Oct. 23, announcing their return for Oct. 28.

While Western fans may not think twice about the photo, the concept is radically-sexy for K-pop standards. Some may think the duo have already taken things too far.

Still, both HyunA and Hyunseung are coming off of hot years for their respective K-pop groups. Female quintet 4minute hit No. 1 in June with electro-hip-hop track "What's Your Name?" while the six-member boy band Beast saw their ballad, "Will You Be Alright?" hit No. 1 just two weeks later.

Take a trip back in time with the steamy "Trouble Maker" music video that's earned 35.1 million views since November 2011.