2In a large bowl, combine the Gochujang, Gochugaru, Soy sauce, Sugar, Minced garlic, Minced ginger, Sesame oil, Black pepper, Cheongju, and Ground perilla seeds to create the marinade.
3Add the cut chicken thighs to the marinade and mix thoroughly, ensuring all pieces are well coated. Marinate for at least 30 minutes at room temperature, or up to several hours in the refrigerator.