In a saucepan over medium heat, add 1 tablespoon of olive oil. Add the minced garlic and cook for 30 seconds to a minute, stirring frequently. Give the cornstarch and water a quick stir again, in case the cornstarch settles to the bottom of the bowl. Carefully pour the water into the saucepan. Next, add the soy sauce, gochugaru, and sugar. Once the liquid reaches a boil, reduce the heat slightly and let it simmer for another 2 to 3 minutes.