Begin by patting the chicken wings dry with paper towels to ensure the batter adheres better and results in a crispier texture.
In a large bowl, combine the flour, cornstarch, baking powder, salt, and black pepper. Mix the dry ingredients well.
Dredge each chicken wing in the dry mixture, ensuring each piece is coated evenly. Shake off any excess flour.
In a deep frying pan or skillet, heat oil over medium-high heat until it reaches 350°F (175°C). Use a thermometer for accuracy.
Carefully add the chicken wings to the hot oil in batches to avoid overcrowding. Fry the wings for about 10-12 minutes, turning occasionally, until they are golden brown and crispy.
Remove the wings from the oil using tongs or a slotted spoon and drain them on paper towels.
In a separate saucepan, combine gochujang, honey, soy sauce, minced garlic, sesame oil, and rice vinegar. Heat over low flame, stirring until the sauce is well mixed and heated through, about 3-4 minutes.
Toss the fried chicken wings in the sauce until they are evenly coated.
Serve the Korean Fried Chicken immediately, garnished with sesame seeds and chopped green onions if desired.