Combine the chicken pieces with the sauce (reserving one tablespoon if you’re going to make fried rice at the end) and marinate while preparing vegetables.
Cut the sweet potato in half lengthwise and then thinly slice crosswise and slightly diagonally. Cut the cabbage, kkaennip, and scallion into small pieces.
Heat a pan over medium high heat. You can add a tablespoon of oil if you want, but it should not be necessary. Add the chicken, sweet potatoes, rice cakes, and cabbages. Cook, stirring occasionally.