Blanch the tofu noodles and rice noodles in boiling water.
Cut the chicken breast into bite-sized pieces.
Heat cooking oil in a pan and stir-fry the chicken breast.
Once the chicken is cooked, add kimchi and onion, and stir-fry together.
Add tofu noodles and rice noodles, then season with sauce (soy sauce, gochujang, sugar, etc.) and stir-fry.
Mix everything together well, remove from heat, and plate.