Soak beef in water for 10 minutes to remove blood.

Slice green onion diagonally.

Slice shiitake mushrooms after washing them post-cutting.

Slice green chilies diagonally.

Cut radish into quarters.

Clean and wash bean sprouts thoroughly.

Stir-fry beef with 5 tbsp soup soy sauce, 2 tbsp soy sauce, and 1 tbsp sesame oil.

Add 1 tbsp minced garlic and continue stir-frying.

Add radish to the beef and stir-fry until slightly softened.

Add 7 tbsp red pepper powder and 1 tbsp chili oil (optional) to the mixture.

Add shiitake mushrooms and stir-fry briefly.

Add water and bring the soup to a boil.

Once boiling, add bean sprouts.

Add green onion and green chilies.

Cover the pot and let it boil vigorously for a while.