By knowing the word 故 you'll know the reading for this word too! Here's a mnemonic in case you need a reminder, though:
You're using WaniKani, therefore you're studying kanji and vocab. Whose fault is it? It's WaniKani's fault! But, your brain has been beaten to a mush from all the studying, so when you say "it's your fault" it comes out as "it's yue fault!" Go ahead and say it out loud that way.
I was repeatedly late without permission and consequently my vacation days were cut short.