It is definitely hard singing live and idols are always tired from being overworked and all. Sometimes it's best not to strain their vocals!  Still, it can be pretty humorous or even o_O when you catch an idol lip-syncing!  In some cases, it could be that they're not used to lip-syncing and the event called for it, so they had no choice.

For others, you can argue that they were just singing with a back track and wasn't lip syncing the whole time.  Either way, they made a mistake and their mistakes are cute, so check out these instances below!

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Tiffany

IOI's Kim Se Jung

At 3:25

LABOUM's Haein

At very beginning

G-Friend's Eunha

At 0:43

SHINee's Onew

At 2:09

4minute's HyunA

At 1:58

Red Velvet's Yeri

At 1:05 

Block B