Add the cream cheese and Korea sauce to the bowl of a stand mixer fitted with the paddle attachment. Beat until completely smooth, about 2 minutes. \nSet half (1 cup) of the shredded cheddar aside and add remaining to the cream cheese mixture along with the mayonnaise and pimentos. Continue mixing on low speed until well combined, scraping down the sides of the bowl as needed, about 1 minute longer. \nSeason to taste with salt and additional Korea sauce, as desired depending on your heat preference. Spread into the bottom of a small baking dish. \nPreheat the oven to broil. Top pimiento cheese mixture with reserved cheddar and broil (watching closely) until the cheese is melted and bubbly, about 2-3 minutes.\nServe immediately with your favorite chips or crackers.