In a 12 inch cast iron skillet, or a large dutch oven, heat at least 2 inches of neutral oil, such as canola or safflower to 350°F.
In a large shallow pan, whick together all-purpose flour, cornstarch, Korean spice mix, kosher salt, and black pepper.
Remove one piece of chicken at a time from the brine and allow excess to drip off. Dredge on both sides in the seasoned flour. Dip back into the buttermilk brine on both sides and then return to the flour, coating both sides thoroughly. Place coated chicken on a parchment lined large baking sheet and repeat the dredge with the remaining chicken.
Use tongs to carefully place chicken into the hot oil (no more than 2 at a time) and fry for 7 to 8 minutes, or until lightly golden brown, turning chicken over halfway through the frying time. Use a thermometer to check that the internal temperature of the chicken is at least 165°F.
Use tongs, or a spider strainer, to carefully remove the chicken from the oil and place them on a large baking sheet fitted with a wire rack. Repeat with the remaining chicken. Increase oil temperature to 375°F.
Return the chicken to the oil, 2 pieces at a time, for 1 to 2 minutes, until the coating is super crispy and darkly golden. Set back on the wire rack and brush with spicy maple honey butter, and sprinkle with more Korean spice mix.
Serve the chicken on top of one or two waffles, depending on your appetite. Drizzle with more spicy maple honey butter and garnish with chopped chives and sesame seeds.