On this episode, the 8 grandma rappers and producer teams found out which rapper took home the first diamond from their 1st round battle, after which they promptly began the 2nd round! 

The theme given for the grandmas' 2nd round was idol groups! So far, aerobics trainer Yeom Jung In and 'Show Me The Money 4' winner Basick partnered up for Big Bang's "Fantastic Baby", actress Moon Hee Kyung and rapper Cheetah took on EXID's "Up and Down", actress Lee Yong Nyeo and MC Sniper pour their hearts out on a rendition of IU's "Your Meaning", and grandma rapper Choi Byung Joo with Phantom's Hanhae and KittiB covered G-Friend's "Me Gustas Tu"! 

But which team has possession of the most real-time votes so far? The cards have played in favor of the show's youngest contestant, actress Moon Hee Kyung, with producer Cheetah! 

See how amazingly these elderly grandmas have transformed these popular idol songs, and tune in to see which of the remaining teams can beat Moon Hee Kyung and Cheetah next week on 'Hip Hop Nation'!