In a large pot, heat the vegetable oil over medium heat. Add the ground pork and cook until browned, breaking it apart with a spoon, about 5-7 minutes.
Stir in the minced garlic and ginger, cooking for another 1-2 minutes until fragrant.
Add the sesame paste, soy sauce, and chili paste, mixing well to combine. Cook for an additional 2 minutes.
Pour in the chicken broth and add the miso paste, stirring until the miso is fully dissolved. Bring the mixture to a simmer.
Add the ramen noodles to the pot and cook according to package instructions, usually about 3-4 minutes.
In the last minute of cooking, add the chopped bok choy to the pot.
Once the noodles are cooked, remove the pot from heat and stir in the sesame oil.
Serve the ramen hot, garnished with sliced green onions and a soft-boiled egg if desired. Drizzle with chili oil for extra heat.