When He First Became Emperor, Li Er Wanted to Establish the Xuanwu Sect Inheritance System.

[Dazhou, Shuangwen, System, Comprehensive History] Li Ying traveled to the Zhou Dynasty and became Wu Zetian's son. I'm mediocre, yes, but I can't stand up to my mother's awesomeness! You want to bully me, right? Don't even look at the heads on your heads!