What is the origin of legendary sword Su Jin?

In the 20 14 TV series "The Legend of the Sword and the Chivalrous Man", Wang Yimiao plays Jin Niang.

In the play, Jin Niang, also known as Su Jin, is very different from the game in terms of human design. She was originally a handmaid of the Jade Altar. Later, because Candle dragon learned divination with scales, she temporarily lived in a house full of flowers (not the owner of a house full of flowers) and colluded with Lei Yan, so she became a graceful figure and followed Ouyang Shaogong. Finally, he ate Shumingdan (that is, Jiao Ming) and died.