Clean the squid thoroughly and cut it into bite-sized pieces.
Peel the radish and slice it into rectangular pieces.
Heat perilla oil in a pot and stir-fry the squid and radish.
Pour in enough water to cover the ingredients and bring to a boil.
Season with soy sauce and minced garlic.
Chop the green onion and add it to the soup, then boil briefly.
Adjust the final seasoning with salt.