Members of four rookie girl groups teamed up with 'It's Live Band' for solo performances and a cover of MAMAMOO's 'Um Oh Ah Yeh'!

CLASS:y's Won Jimin, woo!ah!'s Wooyeon, TRI.BE's Songsun, and Billlie's Haram presented their great vocal abilities through various songs:

Jimin: Taeyeon - 'If'
Wooyeon: BoA - 'Atlantis Princess'

Songsun: IU - 'Hey'
Haram: TVXQ! - 'Mirotic'

Check out the video above!