In a large bowl, combine gochujang, honey, soy sauce, rice vinegar, sesame oil, minced garlic, minced ginger, and black pepper. Mix well to create a marinade.
Add the chicken wings to the marinade, ensuring they are well coated. Cover and refrigerate for at least 1 hour, or up to overnight for maximum flavor.
Preheat the air fryer to 400°F.
Remove the wings from the marinade, allowing excess marinade to drip off. Arrange the wings in a single layer in the air fryer basket.
Cook the wings in the air fryer for 25-30 minutes, flipping halfway through, until they are crispy and cooked through.
Once cooked, remove the wings from the air fryer and sprinkle with sesame seeds and sliced green onions before serving.