Boil the dry Guilin rice noodles per the package instructions until al dente. Rinse the noodles with cold running water to remove the starch of the noodles (the noodles should be smooth and clean of starch after rinsing). Drain the noodles dry and set aside.
In a pot, add the butter and saute the ginger. Add the chicken broth and water and bring it to boil. Add the evaporated milk and follow by the crab. Cook for a few minutes until the crab turns red and cooked. Add the baby bok choy, rice wine, fish sauce, white pepper, scallion, and the noodles. Bring it to a quick boil and serve immediately.
Add 2 more tablespoons of evaporated milk if you like your crab bee hoon creamier.