Wash the cabbage and young radish thoroughly and cut them into bite-sized pieces.
Boil the spaghetti noodles in boiling water for 8 minutes, then rinse them in cold water.
Put the cabbage and young radish in a bowl, sprinkle with a little salt, and gently mix by hand.
Mix gochujang, soy sauce, vinegar, sugar, and sesame oil to make the spicy sauce.
Add the noodles, vegetables, and spicy sauce to a bowl and mix evenly.
Serve in a bowl and sprinkle with sesame seeds and seaweed flakes to finish.