Fill a bowl with water, a splash of vinegar, and a pinch of baking soda. Soak the wings for 10 minutes, then rinse well and pat completely dry with paper towels.
Combine the paprika, salt, garlic powder, onion powder, black pepper, white pepper, and baking powder in a large bowl. Add the wings and toss until every piece is well coated. For best results, place on a wire rack and let dry in the fridge for at least 30 minutes before cooking.
Preheat the air fryer to 200°C. Place the wings in a single layer in the basket without overcrowding. Air fry in batches for 20 to 25 minutes, flipping halfway through, until deep golden and crispy.
While the wings cook, melt butter in a pan over medium heat. Add the minced garlic and sauté for a minute until fragrant. Add the brown sugar, chilli flakes, gochujang paste, soy sauce, ketchup, lemon juice, and honey. Stir and simmer for 2 to 3 minutes until the sauce thickens and turns glossy.
Add the hot wings to a large bowl and pour the sauce over the top. Toss until every wing is fully coated.
Transfer to a serving plate and garnish with sesame seeds, chopped spring onions, and lemon slices. Serve immediately.