I've seen 4 films starred by the one person,but I don't know the person's name.he is a German actor.the film should be a German film.One of his film is about one under-cover police,he went into a group which dealt with drugs.he won the boss's trust immediately,then he met the boss's daughter.but he is betrayed by a police and the police made him blind and killed the boss,the leading role was supposed to be the murderer.he had no one to help him,so he came to the boss's daughter,under the help of the boss's daughter,he revenged at last.Does anyone know this film's name and the actor's name?