For Instant Pot: Use sauté button, when hot, add soy sauce, rice vinegar, honey, garlic, ginger, and red pepper flakes. Cook 2 minutes, stirring. Add chicken, cover, and lock the lid. Cook on high pressure 15 to 20 minutes, until chicken is tender. When pressure releases, remove chicken and sauce from instant pot and plate. Garnish with scallions, if desired.
For Stove Top: Combine soy sauce, rice wine, honey, garlic, ginger, and red pepper flakes in a large, nonstick pan. Cook over medium-low heat. Stir and heat for about 2 minutes. Add chicken legs and cook for 5 minutes, Turn chicken, cover and cook for 20 minutes. Turn again, cover pan and cook for about 15 minutes more, until chicken is very tender. Remove chicken and sauce from pan and plate. Garnish chicken with scallions, if desired.