Wash the short ribs twice, then fill up your pot with water and soak the meat for 1-2 hours. Afterward, drain and wash it 1-2 times again.
Fill up your pot with water and parboil the meat for 5-10 minutes. During this time, you will see a lot of scum floating on top. After parboiling, drain them out.
Fill your pot with water again and boil the meat on medium heat with the garlic cloves, onion, scallions, radish, and peppercorns. Let it boil for 1.5-2 hours.
At the 30-minute to 40-minute mark, remove the radish, chop in thin slices, and set aside for later use.
At the 1.5 to 2-hour mark, drain the soup in another pot and remove the bones and the aromatics.
Place the meat and radish back into the soup, bring it to a simmer, and season with minced garlic, soy sauce for soup, salt, and pepper.
Serve with rice and kimchi, and enjoy!