Slice the cucumber and cabbage into thin strips, and mix the ingredients for the spicy noodle dressing.
Cut the flat iron into long strips, marinate it in the beef seasoning, and stir-fry.
Boil the noodles in hot water and drain. Also boil the egg and cut it in half.
In a bowl, place the boiled buckwheat noodles, then top with cabbage, cucumber, stir-fried Hanwoo, radish sprouts, a half of boiled egg, and the dressing.