This was written on a rock on Cobra Kai on Netflix. [Season 3 , Episode 8 , ~ 22.5 minutes]
What does it mean ?
Envy shows a rockless garden
I'm surprised and disappointed if it means nothing or if at least it is a bad translation of something. They had a great chance to impart some wisdom from both Japanese culture and from karate philosophy. Why would they not hire experts to confirm all these details ? At S3E4 ~32.5 minutes, Daniel clinks drinks with Kumiko and says kanpai, she responds with karii. I looked it up and karii is in fact an Okinawan version of kanpai. I was impressed by this. Why they couldn't do the same for the writing on the rock is beyond me.
Chekhov's gun : https://en.wikipedia.org/wiki/Chekhov%27s_gun