Heat sesame oil in a large skillet over medium-high heat. Add the ground beef and cook for 5-6 minutes, breaking it into small crumbles, until browned. Drain excess fat if needed.
Add the minced garlic and ginger to the skillet. Cook for 30 seconds until fragrant, stirring constantly.
Stir in the soy sauce, gochujang, brown sugar, and rice vinegar. Let the sauce simmer for 2 minutes, stirring to coat the beef evenly.
Meanwhile, cook the ramen noodles according to package directions, reducing the cooking time by 1 minute. Drain the noodles.
Add the drained noodles to the skillet with the beef and sauce. Toss everything together until the noodles are fully coated in the glossy sauce.
Serve immediately, topped with sliced green onions and sesame seeds.
Notes
Adjust the gochujang to your heat preference — start with 2 tablespoons and add more if you like it spicier. Store leftovers in an airtight container in the fridge for up to 3 days. Reheat in a skillet with a splash of water.