Clean the cockles thoroughly, boil them in water, and remove the shells.
Boil the chewy noodles (jjolmyeon) in boiling water, then rinse in cold water.
Julienne the cucumber, carrot, and cabbage.
Make the spicy sauce by mixing gochujang (Korean chili paste), chili powder, soy sauce, sugar, vinegar, and sesame oil.
Combine the cooked noodles, cockles, vegetables, and sauce, and mix well.
Place in a bowl and top with boiled egg, seaweed flakes, and sesame seeds to finish.