Preheat your oven to 350°F.
In a large bowl, combine the ground beef, breadcrumbs, onion, carrot, milk, egg, soy sauce, brown sugar, gochujang, garlic powder, ginger powder, black pepper, and salt. Mix until just combined, being careful not to overmix.
Transfer the meat mixture to a loaf pan and shape it into a loaf.
In a separate bowl, mix together the ketchup, brown sugar, soy sauce, and gochujang for the glaze. Spread the glaze evenly over the top of the meatloaf.
Bake in the preheated oven for 50-60 minutes, or until the internal temperature reaches 160°F.
Let the meatloaf rest for 10 minutes before slicing.
Garnish with chopped green onions before serving.