Cut fish cake and onion into bite-sized pieces.
Rinse tofu noodles under running water.
Heat olive oil in a pan and sauté the onion.
Add fish cake and tofu noodles, then stir-fry.
Add water, low-sugar gochujang, chili powder, and soy sauce, then bring to a boil.
Once it boils, add green onion, mix, and serve on a plate.