How do I know if this thing growing on top of my kimchi is safe or not?

I have been fermenting my kimchi for only a month in my refridgerator and when I opened them all up, they all have this white stuff on top of them. I am not sure if I should just throw them all away or just remove the thing growing on the top.is it still safe to just remove the top and eat the rest?

The kimchi smells good, fermented without bad smell.