Big Brother Villain, Everyone in the Sect Wants Me to Die

I travel through Shuangwen and become the senior brother of Kendo Mountain. In this book, I am not the protagonist, but a villain, the kind that opposes the protagonist. Not only do I have to deal with the protagonist, but I also have to guard against the beautiful master and several junior sisters, because the master and the junior sisters have cheats and want to kill me. In this way, I struggled to survive in the sect. Other than that, the luckiest thing for me is probably to get a system. This system says that as long as I kill the protagonist, I can return to the original world. In this way, I assassinate the protagonist and prevent being killed at the same time. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.