Rinse the angelic noodles under running water and drain well.
Julienne the onion, green onion, zucchini, and carrot.
Heat cooking oil in a pan and stir-fry the green onion to bring out the aroma.
Add onion, zucchini, and carrot, and stir-fry.
Add soaked chicken breast or tofu and stir-fry together.
Add jajang powder and water, then bring to a boil.
Pour the sauce over the angelic noodles to finish.