Chop eggplant into cubes and soak them in a bowl of water and 1 tsp salt for 10 minutes.
In a bowl, mix the cornstarch, salt, white pepper, garlic powder, onion powder, 5-spice and gochugaru. Toss the eggplant cubes in this mixture until evenly coated. You can also coat them one by one but it may take more time.
Heat oil in a pan over medium-high heat. Once hot, add the eggplant cubes in a single layer (you may need to do this in batches).
Fry until golden and crispy on all sides, about 3-4 minutes per side. Remove and drain on paper towels.
On a separate pan, saute finely chopped onions, red chili and saute for 3 minutes. Add spring onions and eggplant, give it a good toss.
Mix seasoning - 5-spice, white pepper, garlic powder and salt. Mix well and sprinkle on eggplant. Give it a good even toss and serve!