Mandu are Korean dumplings that are commonly filled with minced meat (usually pork), tofu, green onions, garlic, glass noodles. It’s another famous street food that is eaten as a meal.
It's an old video, but it explains how Korean street dumplings are.
But... Koreans eat a lot of Mandu at home. If you want to eat Mandu at home, please refer to the video below.