Travel Through the Shentong Republic of China and Backstab Yourself at the Beginning!

My name is Zhang Chu, and I have traveled through time. Good news: I have a system. Bad news: The system was given to me by the original owner. Even worse news: The skill I inherited is backstabbing a fellow sect member. In order to survive, I trampled my senior brother to death and stripped him of all his wool. I thought I could grow up safely, but I found out that I was actually an undercover agent. When the master smiled and asked "Who is the ghost in the family?" I pointed at the eight brothers and sisters: I reported it, they all have problems! And the Sixth Senior Sister in the corner was giving me a weird smile...?