For the next few days, Ling Pingan stayed upstairs.
Apart from going downstairs to get takeout, he was busy preparing all kinds of historical materials and materials for the Song dynasty.
In less than two days, his bedroom was filled with all kinds of historical books.
There were the orthodox "Xu Zizhi Tongjian" and "History of Song" , as well as all kinds of unofficial histories and jokes. There were also the notes of scholars at that time, as well as all kinds of papers and research reports downloaded from the Internet.
There were also various maps hanging on the wall of the bedroom. They were basically the boundaries of the Song dynasty, the administrative regions, and the surrounding regions, as well as the traffic routes.
In short, he had already done sufficient preparation.
Now, all that was left was to determine the time and the identity of the main character.
However..
There was no rush!