It has been revealed that rookie group SPICA's member�Kim Boa was INFINITE's former vocal trainer. A Youtube video posted on December 15, 2010 has been recently drawing attention as it showcases Kim Boa's sweet vocals while she sings a duet with Sunggyu from INFINITE. It's no surprise that the top sexy star Lee Hyori herself is supporting SPICA seeing that Kim Boa, the lead vocalist, has such a great voice. Watch as Kim Boa sings 'Lucky' by Jason Mraz ft. Colbie Caliat with INFINITE's Sunggyu: