Wash the cucumber, seaweed, and kkosiraegi (thread seaweed) thoroughly.
Soak the seaweed and kkosiraegi in water, then squeeze out the excess water.
Slice the cucumber thinly into half-moons, sprinkle with salt, and squeeze out the water.
Put the cucumber, seaweed, and kkosiraegi into a bowl and add the seasoning sauce (chili powder, minced garlic, vinegar, sugar, salt, sesame oil, and sesame seeds).
Mix well so the ingredients and seasoning are evenly combined.
Plate and serve.