Make room for the egg by pushing all noodles to the side of the wok. Crack the egg onto the wok and scramble it until it is almost all cooked. Fold the egg into the noodles. The noodles should soft and chewy. Pull a strand out and taste. If the noodles are too hard (not cooked), add a little bit of water. When you get the right taste, add shrimp and stir. Sprinkle white pepper around. Add bean sprouts and chives. Stir a few more times. The noodles should be soft, dry and very tangled.