To make the cold broth, scoop out the watermelon insides (you'll want to stick the watermelon in the fridge beforehand to chill).
Blend the watermelon, gochujang paste, soy sauce, sesame seeds, garlic, sweetener, vinegar, Asian pear, basil, dongchimi and broth together. Top with cucumber.
Cook the Korean cold noodles according to the package instructions and rinse well in cold water to wash off the excess starch. Add to the hollowed-out watermelon half. (You can slice off the bottom of the watermelon so it doesn't wobble around on the plate!)
Pour in the watermelon broth mixtur.
Top with Asian pear, cucumber, soft-boiled egg, and sesame seeds, then serve!