Soyu of SISTAR will be joining forces with hip-hop vocalist JungGiGo  as they form a new duet unit. In 2013, Soyu showed off her impressive vocals with rapper MadClown as they formed their own successful duet unit. Now, in 2014,  Soyu is back, this time with Starship X’s 2nd project “Some.” The song is said to be a medium tempo…