Rinse the konjac rice cakes under running water.
Slice the onion and green onion into bite-sized pieces.
Heat olive oil in a pan and sauté the vegetables.
Make the sauce by mixing gochujang, red pepper powder, soy sauce, and water.
Add the konjac rice cakes and vegetables to the sauce and bring to a boil.
Add fish cake and simmer over medium heat for another 5 minutes.
Season to taste with salt and pepper at the end.