The Ching had defeated the Ming and the Southern Shaolin Temple lay in ruins. All Ming supporters were being killed and persecuted. The purpose of the Wing Chun myth and the truth it protected was a necessity of the times. The Myth is a fable about a Nun named Ng Mui who supposedly developed the art of Wing Chun and taught it to a young woman named Yim Wing Chung (the name Yim means to be discrete or secretive) who was having domestic problems, after which the art was named and thus creating the myth. This was during the darkest days in the history of Wing Chun. The Wing Chun System was so effective that in order to protect its secrecy this cover story had to be created.
First of all, the Buddhist temples would not have had a nun in an environment with men in a celibate state of commitment. Second, the art of Wing Chun is so complicated that it could not be conceived by one person and from current information it can be deduced that Ng Mui had no connection to the inception and development of Wing Chun. Further, it is very unlikely that during these perilous times that people would put the whole of a revolution at risk to solve a domestic affair. The name “Yim (discrete) Wing (Everlasting) Chun (Spring)” itself is a code meaning “Be discrete and keep faithful until the rebirth (Everlasting Spring) of the Ming”.
In reality Wing Chun was developed in the Southern Shaolin Temple in the Wing Chun Dim. The Monks provided the Chan aspects of the art and the Military personnel, who had taken on the persona of monks, provided the martial aspects of the art. Wing Chun is a collaboration of many people working together to develop a martial arts system that could be used to defeat the Ching and any other system while utilizing Time, Space, and Energy in a 3 dimensional environment with maximum efficiency.