f(x) Luna performed 'I'm Alright' with Ailee, Eunji, and Solar at SBS' Gayo Daejun

f(x)'s Luna has graced the 2015 SBS Gayo Daejun with her powerful voice!

Together with Ailee, Apink's EunJi, and Mamamoo's Solar, here's their special stage where they performed 'I'm alright' (I will Survive Korean Ver.)'~