Traveling Through the Tang Dynasty: Xuanwumen Fight at the Beginning

Li Jiancheng was a social beast in the 21st century. After a sudden death while working overtime, he traveled to the Tang Dynasty and became Li Shimin's brother, Li Jiancheng. What? The beginning is the Xuanwumen Incident, you let me, a social beast, and Admiral Tiance fight against each other! I'm tired, just destroy it, I just want to destroy it. Activate the broken system and rely on the system to help Li Erfeng become the leader of the earth step by step.