In a large bowl, mix the salt, Korean chili powder, and garlic powder (or freshly chopped garlic) with cold water until completely dissolved.
Add the chicken wingettes/drumettes to the salt water solution, making sure they are completely submerged. Cover the bowl with plastic wrap and place it in the refrigerator overnight or for at least 8 hours.
The next day, remove the chicken wings from the salt water solution and place them in a plate.
Mix the Korean fried chicken mix and cold water in a bowl using an equal weight ratio, and whisk them together until fully combined. Pour the batter onto the chicken wingettes, then flip each one so that they are evenly coated with the batter.
Add Korean fried chicken mix into a gallon Ziploc bag, place 6 chicken wingettes (batter-coated) into the bag and seal it tightly, leaving some air inside.
Shake the bag vigorously until the chicken wingettes are evenly coated with the flour mixture.
Take out the chicken wingettes from the Ziploc bag and gently shake off any excess flour mixture. Transfer the coated chicken wingettes onto a large plate. Repeat the process with the remaining chicken wingettes, doing six at a time, until they are all coated with the flour mixture.
Heat oil in a heavy-bottomed pot to 320°F.
Gently add the chicken wingettes to the hot oil and fry them for approximately 3 minutes, or until they turn golden brown and crispy. Adjust the heat level to maintain the oil temperature around 320°F. Place the fried chicken wingettes on a wire rack to drain any excess oil. (Depending on the pot size, you may need to fry the chicken wingettes in multiple batches.)
After placing all the chicken wingettes on the wire rack to cool down, increase the temperature of the oil to 355°F. Gently add the chicken wingettes back into the hot oil and fry for another minute, or until they turn crispy and golden brown.(Depending on the pot size, you may need to fry the chicken wingettes in multiple batches.)
Remove the chicken wingettes from the oil and place them on a wire rack to drain any excess oil.
Add all the sauce ingredients to a nonstick frying pan, stir and thicken the sauce over low heat until bubbling. Toss the fried chicken wingettes with the sauce until they are evenly coated. Serve hot.