Peel the radish and slice it thinly into strips.
Peel the onion and slice it into thin strips.
Place the radish and onion in a bowl, add a little salt, and let it sit for 10 minutes.
Squeeze out excess water from the salted vegetables.
Add chili powder, minced garlic, vinegar, sugar, salt, and sesame oil, then mix well to coat everything evenly.
Sprinkle sesame seeds on top to finish.