On December 9th, Cube Entertainment's new project duo finally made their debut on KBS's 'Music Bank'! 4minute's HyunA and B2ST's Hyunseung teamed up to create 'Trouble Maker', and they've certainly lived up to their name with their racy choreography. Unfortunately, Trouble Maker was forced to change up their choreography after receiving numerous complaints. Check out their modified dance routine below! === [ Backstage Interview ] - - ===