In a large bowl, mix sugar, salt, soy sauce and cornflour slurry together. Mix in the minced pork. Let sit for 20 minutes.
Heat a large frying pan with 1 tablespoon oil over high heat. Stir-fry the pork until cooked, about 3-4 minutes. Drain and set aside.
Heat the same frying pan with 1 tablespoon oil over high heat. Saute the garlic, spring onion and chillies until aromatic, 2-3 minutes.
Stir in the onion and salt; cook until soft, 3-4 minutes. Add the kimchi and stir for 1-2 minutes. Gently stir in the tofu, chicken stock, water, mushrooms, salt and sugar. Heat through and simmer for 5 minutes.
Turn the heat off and stir in the vermicelli. Serve hot.