Trouble Maker (트러블메이커) is a South Korean co-ed sub-unit consisting of 4minute’s Kim HyunA (현아) & B2ST’s Jang Hyun Seung (장현승), also known as JS. The group's debut single, Trouble Maker, peaked at #1 on GaOn, Korea's official chart, and achieved a triple crown on MNet's M! Countdown and one win on SBS's Inkigayo and jTBC's Music on Top respectively. The duo was also awarded at the Mnet 20's Choice Awards for "Hot Performance Star", Mnet Asian Music Awards for "Best Collaboration" and Melon Music Awards for "Hot Trend Song" in 2012.

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