Cut the radish into bite-sized pieces.
Blanch the radish briefly in boiling water together with the rice cakes.
In a pan, mix gochujang (Korean red chili paste), gochugaru (red chili flakes), sugar, soy sauce, and minced garlic to make the sauce.
In a pot, add the sauce, water, blanched radish, and rice cakes, then bring to a boil.
Once it starts boiling, add fish cake and simmer over medium heat.
When the radish turns translucent and the sauce is absorbed, add green onions and boil once more.
Serve in a bowl to finish.