Shen Du, a high school Chinese teacher, transmigrates to the Northern Song dynasty and discovers that he lives on Zishi Street in Yanggu County, right next door to Wu Dalang.
He taught Water Margin for eight years, and every year his class would erupt in arguments when they reached the chapter about Wu Song killing his sister-in-law. Now he doesn't have to argue. He only needs to step next door and say a word to change Pan Jinlian's fate.
But he doesn't.
He sets himself one rule: save Pan Jinlian alone, without changing the fate of anyone else in Water Margin. Wu Song will still kill Ximen Qing and still join Liangshan. Not one word of the fates of the 108 heroes will change.
What he does is harder: he isn't choosing a path for her, but giving her one when she has nowhere left to go.
Whether she takes it is up to her.