TV series in 70s - 80s about a beautiful lady ghost living in a big old house or castle.
The male lead is a young artist or something. He found the old house and moved in for free (or for a very low price). The lady ghost is always wearing the same long elegant dress. Being a ghost, she can go straight through walls.
The young man has no idea for quite a while that the lady is a ghost. He falls in love with the ghost lady. The lady has some magic power and loves to help others.
Sadly I don't know what language it was in. Because it had been translated all into Chinese. And I am one hundred percent sure it was not a movie. Now many people in Shanghai remember the show. But the Chinese version can not be found anymore.