Five Books - (Water Margin) the Green Swallow Flies Around the White Wolf

A "white wolf" "obeys" the teacher's order, rescues Yan Qing, and goes to Liangshan in a carefree manner. What's the secret of Master's bag? How to explain the word "lost one's body"? Will "White Wolf" fall in love with "Qingyan"? When the "werewolf" comes to "Water Margin", terrible things happen... PS: This story is derived from "Water Margin". Due to the needs of the plot, there is some disrespect to the original work. Please bear with me.