Mix rice flour with water in a pot and bring it to a boil over medium heat for 5-8 minutes until it thickens. Once the rice mixture is cool, place it in a bowl and mix it with the Korean chili flakes and shrimp powder
Place the radish in a large mixing bowl with fine sea salt, fish sauce, and salted shrimp. Let it stand for 10 minutes for the radish to salt down. Add Korean chives, carrots, chopped garlic, chopped ginger, sugar, finely chopped onion, and the Korean chili flake mixture from step 5. Mix them well, and the kimchi paste is made and ready for use
Place a quarter of cabbage on a plastic container and spread the seasoning over each leaf. (You only need to season one side of the leaf.) Repeat this step for the remaining three quarters of cabbage. Do not pull the cabbage leaves off the stem; leave them attached to keep it together
Place the kimchi in an airtight container (and put the lid on). Let it sit at room temperature for 24 hours, then move it to the refrigerator. You can start eating it when it has cooled, but ideally, wait another 3-4 days to allow it to develop more flavor.
Kimchi can keep for a long time in a sterilized pickling jar