No Gochugaru is a unique kind of red chili flake very common ingredient in Korean cuisine. Korean red pepper flakes have a deep red color with a more fruity, slightly sweet, and earthy flavor. Substituting Gochugaru with regular red pepper flakes will make not give the salad the same flavor and color. However, you can still go ahead and use regular red pepper flakes if you can’t get gochugaru. Adjust the amount of red chili flakes to use depending on the spice levels.