Exact number of North Koreans KIA in Kursk is 101.
Iirc the deployment was some 15-16K.

That would disprove, beyond doubt, any claims of human waves or mass casualties.
It's less than 1 KIA per day and all in all about 0.6% casualties from what seems like a year long deployment where Ukraine has an 89% casualty rate among deployed (using western commanders, training, equipment and tactics).

https://youtube.com/watch?v=2Tt1ODcI4is