What is this white, non-fuzzy, substance on my kimchi? I have a jar of store bought kimchi that I neglected for a few months (bought around mid July). Today I opened it and noticed that a few pieces had some white stuff on it, but it doesn't look like mold. The best way to describe it is that it is similar to the white yeast concentrate that collects at the bottom of homebrew or in some unfiltered beers. I took a piece without the white stuff on it and tasted it, and it tasted fine, if a little bit stronger with an almost boozy taste.   I was just wondering what this is and if it's safe to eat, because as far as I know, kimchi doesn't have yeast in it.

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That's mold, and you should discard it.

Kimchi keeps forever (well, years) if and only if it's not exposed to air, meaning there's always enough liquid in the pot to cover the cabbage.  If you have bits poking up into the air and you leave them there for days/weeks, they'll dry out and start growing mold.