On May 4, Mnet's 'I Can See Your Voice 4' welcomed Highlight to the show where the boys made an attempt to discover if the contestants are talented singers or tone-deaf based on clues.

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One of the MCs asked which of the members was best and worst at lip-syncing.  Yoseob commented, "I think I'm pretty good at lip-syncing.  Since I have a small face, the microphone covers it."  Whereas, member Junghyung was chosen as the worst, causing much laughter.