Magical Water Margin: They all call me brother

I've been transported to the world of Water Margin, and I'm starting out marrying Pan Jinlian? And Wu Song is actually a girl?
Having awakened the ability to capture demons, he was wondering where the demons in the Central Plains came from when he suddenly discovered that the 108 heroes were actually the 36 Heavenly Generals and the 72 Earthly Fiends who had descended to earth.
After the grand gathering at Liangshan in 1120, he originally planned to lead his brothers and sisters to refuse the imperial amnesty, and live a carefree and happy life on Liangshan, eating large chunks of meat, drinking large bowls of wine, and dividing gold and silver by the scale... until seven years later, one day in 1127, a fallen leaf brought a message.
No, translate this for me.
What does it mean for the Jurchens to march south? What does it mean for Kaifeng to fall?
What does it mean that the two emperors were captured in the north and Zhao Gou fled south?
Please translate this for me again.
What does it mean when Yue Fei said he started the Northern Expedition? It means he rallied the warriors of Hebei and Shandong to respond to his indomitable expedition.
What the hell is this about the northern grasslands, where a green-skinned demon king named Temujin was born?!
What...where have I traveled to? Is this still "Water Margin"??