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The show takes on the format of cast members forming different teams and inviting guests to compete in karaoke challenges, and Kwon Hyuk Soo, who is the head of the 'Yam' team, went back to the '90s for his karaoke challenge!
Sooyoung and Lee Se Young transformed into '90's female duo BiBi to sing their hit song from 1997 "Skyground Starground". The duo's costumes fit in perfectly with the '90s vibe, the crowd got riled up, and Kwon Hyuk Soo's attempt at rap made the performance a blast!
Watch and jam out above!