Some people refer to Gimbap as Korean sushi. But Gimbap is NOT sushi. In fact, it has an entirely different flavor profile than Japanese sushi.
Gimbap has a unique flavor. The rolled-up nori sheets are packed FULL of a variety of fillings. Common ones include cooked vegetables, savory meat such as bulgogi, and a pickled, sour-sweet flavor from yellow Korean daikon (danmuji).
Sushi contains raw fish and vinegar-seasoned rice. Sushi is also dipped into soy sauce and wasabi. The fillings are different and the rice is seasoned differently.