Thinly slice cucumber and radish.
Boil capellini noodles in boiling water for 3 minutes, rinse in cold water, and drain.
In a bowl, combine the capellini noodles, sliced cucumber, and radish.
Make the seasoning sauce with perilla oil, soy sauce, vinegar, sugar, and salt, then add to the bowl.
Top with shredded seaweed and sesame seeds as garnish to finish.