How do you know for sure an idol doesn't lipsync?

When they forget their lines so often, that it becomes a joke. We clown them so much because they forget their line so often. The thing about Day6 is that they barely have a backtrack so when they forget lyrics and stop singing, it's super obvious because they can't hide

Young K was like FK CAN YOU SAVE ME SING THIS SONG FOR ME PLEASE MY BRAIN GOT FKED

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And yes ... Wonpil. Fking Kim Wonpil the master for forgetting lyrics

HE LITERALLY STOPPED SINGING BECAUSE HE TRYING TO GATHER THE POWER OF HIS 2 LAST BRAINCELLS TO COME UP WITH THE LYRICS

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Lucky MyDays are here to save him, poor boi

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And yes as Jae once said in his reaction video of him reacting to Day6 failing

"We never lipsync, it proves we don't lipsync right?" Jae 2020

Quote from keaji

I knew it was about Day6 forgetting lyrics hahha

See it's so common we aren't even surprised anymore. This is why we need to learn the lyrics better so that we can sing it for them when they flop like 100% of the time