SNSD SeoHyun revealed her identity on 'King of Masked Singer' + performed MAMAMOO's 'You are the Best'

She's definitely the best!

Following her masked performance last week, SNSD's SeoHyun is back to reveal her identity on MBC's 'King of Masked Singer'.  But before that, you should watch her awesome rendition of  MAMAMOO's 'You are the Best'~