Fry flour on butter, but be careful not to become brown.
Add broth and cook for about 5 minutes.
Add cream cheese and soft cheese into soup and cook it, stirring constantly with hand mixer.
Add wine, white pepper, grated hard cheese and water.
Cook, stirring constantly, until the cheese is completely melted.
In a serving bowl, whisk sour cream with chopped parsley. Pour the hot soup into serving bowl while stirring it at the same time and serve immediately.