Last week, a video of Mika from The Boss covering "Billionaire" by Travie McCoy & Bruno Mars was uploaded to YouTube, showing off Mika's incredible vocals and nearly flawless English pronunciation. After seeing the popularity of the video, OPENWORLD Entertainment decided to upload another cover video, this time covering Jay Sean's "Down." Injun does the beatboxing while Hyunmin is on the guitar, check out their awesome cover below.