Boil the buckwheat noodles, rinse them in cold water, and drain.
Julienne the cucumber and carrot.
Mix soy sauce, perilla oil, vinegar, and sugar to make the sauce.
Place the cooked noodles in a bowl and top with cucumber and carrot.
Pour the perilla oil sauce over the noodles and mix well.
Finish by sprinkling crushed seaweed and roasted sesame seeds on top.