Remove the shells and veins from the shrimp and rinse.
Season the shrimp with salt, pepper, and starch.
Heat oil in a pan and grill the shrimp on both sides.
Sauté minced garlic, onion, and bell pepper in the pan.
Add chili sauce, ketchup, gochujang, sugar, and vinegar, then bring to a boil.
Add the grilled shrimp to the sauce and mix well.
Plate and serve.