Discard ramen noodle seasoning and cook ramen noodles in boiling water for 3 minutes. Drain. Set aside.
In a bowl, stir together soy sauce, brown sugar, teriyaki sauce, and red pepper flakes.
Heat oil in a large nonstick skillet. Add pork tenderloin slices, and cook until browned.
Add the soy sauce mixture and continue to cook another 3 to 5 minutes.Add noodles and stir to coat in the sauce.
Sprinkle with green onions and serve.
