Prep your shrimp: De-shell, de-vein and pull of the tail. Mince garlic - set aside 1 Tablespoons worth. Then prep the rest of the ingredients and place it next to your stovetop (We will need to use them quickly).
Put frying pan on medium-high heat. Place some vegetable oil in (3 Tablespoons). Once the oil is hot, place in the minced garlic (1 Tablespoon). Immediately, place in the shrimp as well. Stir-both around until the minced garlic starts to slightly brown. Then turn the heat down to a low.
Add-in Ketchup (2 Tablespoons), Gochugaru (1 Tablespoon), Sugar (1 Tablespoon), Soy Sauce (1 Tablespoon), Vinegar (1 Tablespoon). Put the heat back up to a medium-high and mix everything together.
The sauce will become thick. So dilute it with water (2 Tablespoons). It should now turn into a sauce. Finish it off with butter (1 Tablespoon).
Place it over some rice. Bon Appetit!