2In a large mixing bowl, combine the gochujang, gochugaru, soy sauce, minced garlic, minced ginger, sugar, soju, black pepper, sesame oil, and rice syrup to create the marinade.
3Add the cut boneless skinless chicken thighs to the marinade, ensuring each piece is thoroughly coated. Marinate for at least 30 minutes at room temperature, or up to 2 hours in the refrigerator.