Most recipes are very similar so doing a google search of "Korean Cold Cucumber Soup" will net you some options. Most of the Korean recipes call for the thinner kinds of cucumbers, but I just slice my big cucumbers to size and use them.
Another recipe is for cucumber salads. Pretty easy and very versatile. I'm going to try this one today:
https://themovementmenu.com/easy-korean-cucumber-salad/
Edited to add: Also found this recipe in my own binder. Can't remember if I've ever made it or not as I save "potential recipes". LOL
Chinese-style Raw Vegetable
Chop the vegetable of your choice into 1/2 inch square chunks.
Mix:
2 TBLS soy sauce
1 TBLS vinegar (I'll probably use rice vinegar)
1 tsp sugar
1 tsp sesame oil
Pour over the veggies. Chill if you like. Especially good on cabbage chunks.