Dropping Ashes on the Buddha
https://www.goodreads.com/book/show/152640.Dropping_Ashes_on...
Paraphrasing what one reviewer said on GR, it's a good read if you are taking life too seriously, or, the complete opposite.
I didn't get it the first time I read it.
I do find myself going back to the riddles and the poems in the essays now and then when I feel I'm stuck, blocked, or trapped in a loop. It made me ... more humble?
Also a good read if you just want to learn more about Korean Buddhism and Kong-an's in general.