Bring a small pot of water to a boil and cook the egg for 6 minutes and 30 seconds for a jammy yolk.
Immediately transfer the egg to an ice bath to stop the cooking process, then peel and set aside.
Thinly slice the pork tenderloin into bite-sized strips and finely dice the pork belly.
In a medium pot over medium-high heat, sauté the pork belly until the fat renders and it becomes crispy.
Add the pork tenderloin and minced garlic to the pot, searing until the meat is browned on all sides.
Pour in the water, Shin Ramyun seasoning powder, and kimchi, then bring the mixture to a rolling boil.
Add the dry Shin Ramyun noodles and baby bok choy to the pot, cooking for 3 minutes until the noodles are tender.
Remove from heat and stir in the toasted sesame oil to emulsify and enrich the broth.
Pour the ramyun into a bowl, top with the halved egg and sliced green onions, and serve immediately.