Use fermented or overripe kimchi if possible. If your kimchi is dry and does not have enough brine, add more water to yield 1 cup liquid for the batter along with 1 to 2 teaspoons more gochugaru. Do not skimp on oil; add a tablespoon at a time if the skillet becomes completely dry. This will help crisp up the edges of the pancake while keeping it moist.