Rinse the tofu noodles in cold water and drain well.
Chop the kimchi and onion into small pieces.
Heat sesame oil in a pan, then stir-fry kimchi and onion.
Add the tofu noodles and stir-fry together.
Add red pepper powder, soy sauce, and green onion. Mix everything well and stir-fry.
Finish by sprinkling sesame seeds on top.