Cook somen noodles according to package instruction. Drain and toss with sesame oil. Set a side.
Heat oil in a pan. Add scrambled eggs and keep stirring until the eggs are firm. Cut the scrambled eggs with continuous mixing until crumbly in texture. Continue tossing until eggs have a light brown color. Set a side.
Add oil in the same pan. Sauté Korean chili powder, garlic and shrimps.
Add sugar, light soy sauce and oyster sauce.
Toss in the somen noodles until evenly coated with the sauce. Garnish with scrambled eggs and chopped onion spring.