Cut the rice cakes, fish cakes, and green onions into bite-sized pieces.
In a pan, add water, gochujang (Korean red chili paste), gochugaru (red pepper powder), sugar, soy sauce, and minced garlic, and bring to a boil.
Once the sauce starts boiling, add the rice cakes and fish cakes. Let it simmer over medium heat.
When the rice cakes become soft, add the green onions and let it simmer for a little longer.
Transfer to a bowl and serve.