Bring a large pot of water to boil; add beef chunks, ginger and wine. Bring to a boil; reduce heat to simmer and cook 10 minutes. Strain beef.
Wrap Spice Bag ingredients in cheesecloth and tie together with string.
Heat oil in Instant Pot using saute function. Add ginger, garlic, onion, scallions, tomato, and dried chilies, and stir briefly until fragrant; add tomato paste and spicy bean paste and stir until fragrant. Add wine, dark and regular soy sauces, scraping any bits and pieces from the bottom of the pot. Add beef, daikon, carrots, five spice powder, and brown sugar. Add Spice Bag and beef broth. Beef should be covered with liquid; if not, add a little more water until beef is just covered.
Cook on high pressure for 70 minutes, then let pressure naturally release. Beef should be very tender.
Portion out noodles. Ladle sauce from beef on top of noodles. Arrange bok choy on top. Spoon beef on top. Garnish with scallions, cilantro, and pickled mustard greens. Drizzle with some sesame oil and serve with white pepper.