Prepare the beef brisket and vegetables into bite-sized pieces.
In a pot, sauté the beef brisket over medium heat to render the fat.
Add onion, zucchini, potato, and mushrooms to the beef brisket and continue sautéing.
Pour in rice water (or regular water) and bring to a boil.
Dissolve the soybean paste in the soup and simmer on medium heat for about 5 more minutes.
Add tofu, green onion, and Cheongyang chili pepper, bring it to a gentle boil, then finish.