Pat the chicken thighs dry with paper towels. Season both sides with salt and pepper. Let sit in the refrigerator uncovered for 30 minutes to help the skin dry out.
In a small bowl, whisk together: gochujang, soy sauce, brown sugar, honey, rice vinegar, sesame oil, garlic, ginger. Reserve half the glaze for serving.
Preheat your smoker to 250°F (121°C). Use apple, cherry, or pecan wood. Place thighs skin-side up on the smoker. Smoke for about 60–75 minutes.
Brush the chicken with the Korean BBQ glaze. Continue cooking another 20–30 minutes, brushing with additional glaze once or twice. Cook until the internal temperature reaches 175–185°F (79–85°C).
Increase smoker temperature to 350°F (177°C) for the last 10–15 minutes to crisp the skin.
Drizzle with the reserved glaze and sprinkle with sesame seeds before serving.