Stir soy sauce, brown sugar, garlic, rice wine vinegar, , black pepper, garlic chili powder, ginger, and sesame oil together in a saucepan; bring to a boil.
Whisk cornstarch and water together in a small bowl until the cornstarch dissolves. Pour into boiling soy sauce mixture.
Reduce heat to medium-low and cook until the sauce is thick, 3 to 5 minutes.