Bring a small pot of water to a boil. Soft boil eggs for 6–7 minutes, then transfer to ice water. Peel and slice in half.
Heat sesame oil in a large pan or pot over medium heat. Sauté shiitake mushrooms until golden. Remove and set aside.
In the same pan, sauté bok choy until tender with a slight char. Remove and set aside.
Add broth or water to the pot and bring to a gentle simmer. Whisk in miso paste until fully dissolved.
Stir in soy sauce, rice wine vinegar, chili oil, chili flakes, sesame oil, and MSG. Taste and adjust seasoning as desired for spice and saltiness.
Add ramen noodles directly into the broth and cook according to package instructions, keeping at a gentle simmer.
Add ramen noodles directly into the broth and cook according to package instructions, keeping at a gentle simmer.
Divide into bowls and top with bok choy, mushrooms, soft boiled eggs, green onions, and sesame seeds.
Drizzle with buldak sauce and serve immediately.