Soak the rice cake slices in cold water for about 10 minutes.
Make a small cut on each kimchi dumpling to prepare them.
Pour the broth into a pot and bring it to a boil.
Once the broth is boiling, add the rice cake slices and boil for 5 minutes.
Add the kimchi dumplings to the soup and boil for another 3-4 minutes.
Taste and season with salt and soy sauce for soup.
Serve in a bowl and garnish with seaweed flakes, sesame oil, and chopped green onion.