In a bowl, mix soy sauce, gochujang, sesame oil, brown sugar, garlic, and pepper. Add beef and marinate for 30 minutes (or overnight).
In another small bowl, mix all creamy sauce ingredients until smooth. Chill until ready to use.
In a pot, simmer broth. Add gochugaru, soy sauce, vinegar, sesame oil, and salt. Cook ramen noodles until al dente (about 3 minutes). Remove from heat.
Heat grill pan or skillet over high heat. Sear beef 2–3 minutes per side until caramelized. Let rest, then slice against the grain.
Assemble bowls: add noodles and broth, top with creamy sauce, grilled beef, green onions, sesame seeds, and extra spice if desired.
Notes
This dish is perfect for a spicy, satisfying meal any night of the week.