Great Tang: I Became Li Jiancheng from the Start

Hack to death Li Er, the pretender, and the bastard who killed his brother and forced his father. 0

Can you change your name to Li Jiancheng? You have no sense of empathy.

And in Chapter 3, Li Shimin calls the protagonist Li Mu. Isn't the protagonist's predecessor Li Jiancheng? How did he know that the protagonist's name was Li Mu?

What is the vajra body?