6 Fingered Demon of Lute

There's a weepful melody coming from a lake where A boat is floating on the water, and the melody seems to be re-telling a bloody story that happened 16 years ago.
In order to steal the "demoniac lute", 6 renowned sects surrounded Xue Mei's home. Xue Mei saw her parents slaughtered and her little brother Xiao Lin missing in the midst of the killing; Xue Mei carried the "demoniac lute" running toward a deep valley.