New 'Inkigayo' host Lee Yu Bi kicked off her emcee gig yesterday with a rendition of the smash hit 'Let It Go', originally sung by Idina Menzel for the Walt Disney Animation feature 'Frozen'.

However, many viewers noted after her performance that there were several times when her lips did not match the vocals, insinuating that her stage had been lip synced.

Her agency, SidusHQ, said that the truth lay somewhere in between. "Since she is not a professional singer, we prepared for any mistakes," they said. "The stage used an AR sound system. We believe that the viewers confused her voice mixed with the AR and believed it to be lip syncing."

AR refers to a backing track which partially includes the vocals as an insurance against the real vocals failing for whatever reason. Check out her performance below. What do you think?

SEE ALSO: 'Culinary Class Wars 2' presses on despite Baek Jong Won's controversies, wraps up first shoot