Cook the noodles according to instruction (depending on which type of noodle you choose to use, instructions may be different), rinse under cold water, drain well and set aside.
Mix Korean hot pepper paste, sugar, vinegar, water, sesame oil and sesame seeds well to serve as the sauce and pour onto the noodle.
Add tuna, kimchi and cucumber and mix all the ingredients well.
Poach a egg to place on top of to serve (optional).