No One Dares to Write the Ending for an Qingxu and Pearl

The history books left me seven words: An Qingxu, patricide, and execution. The day I traveled through time and became him, the knife was placed on my neck, and there were still 900 days left before "Fu Zhu". Good news - I can read every line about me in the history books and know in advance how everyone will die. Bad news - every time a historical node is changed, the number of readable words will permanently decrease by one line. The more successful you are, the blinder you become. My father wanted to kill his son to sacrifice the flag, Yan Zhuang wanted me to be a puppet, and Shi Siming came to kill me with a knife. But the history books left out one person: the princess whom King Guangping left in Luoyang, and her ending was only "unknown". In the nine hundred days, I did only two things - survive and steal her from the ending. The historian asked, "Where is the Emperor of Dayan?" The man behind the stove pushed the wine bowl and said, "He died in Yecheng, and it is written in black and white in the history books." A voice came from the back room: "Axu, the salt is gone."