Generally speaking, Tang Taizong will think of Xuanwumen. Everyone knows the story of killing brother and brother, and I extend it. Let everyone understand the cruelty of the struggle at that time. At the same time, when the changes of Xuanwumen were almost made, Donggongwei directly attacked the Qin Palace. Xuanwumen, Li Shimin, was caught off guard, but Li Jiancheng could respond immediately without a head. There is definitely a plan in advance, so there is no one to talk about who is right and who is wrong. It's just a king who lost his head.