In a dutch oven, bring 4 cups of salted water to a boil. Boil pasta al dente according to package directions. Set aside ¼ cup of the pasta water, then drain and rinse pasta. Set aside. Return the dutch oven to the stovetop over medium heat.
Add sesame oil, minced garlic, and red pepper flakes to the dutch oven. Cook for 1 minute.
Next, add pasta water, ½ the chopped cilantro, lime juice, gochujang, chile powder, salt, pepper, rice wine vinegar, and soy sauce. Whisk and cook until it starts to bubble, about 7 minutes.
Add pasta and remaining cilantro and stir well to coat. Cover and cook 2-3 minutes.
Garnish with sliced chiles and enjoy!