Vegetarian Jap Chae

Tried making some Korean noodles, Jap Chae. This usually has meat in it but went vegetarian with spinach, mushrooms, carrots, and onions. The noodles, glass noodles, kinda remind me of shirataki (Japanese yam cake noodles). I was hoping this dish to be very flavorful but it was kinda on the bland side, even with adding more sesame oil, soy sauce, salt, and pepper. I was kinda surprised to see that everything is tossed together rather than cooked together. The glass noodle doesn't absorb the flavors much. I've never had it before so I'm not sure if that's how it was supposed to taste. Looks pretty though. Recipe by Dr. Ben Kim.