Welcome the Enemy Troops into the Pass, Please Help Me Achieve My Great Cause

Long Yunqian, a princess who has been bullied by the royal family of Longyue Kingdom for more than ten years. For sixteen years, my father did not care for me, my brothers and sisters bullied me, and even when the enemy army was about to attack the city, my mother who had been living in the cold palace was gone... Long Yunqian, who was filled with grief, was possessed by Yunqian who came from time-travelling! Once you travel through time, activate the system, and completely change your life! Cheating along the way gives you the opportunity to practice and awaken your alchemy potential! The system explodes crazily, slays demons, and tramples all bullies underfoot! I have never been merciful, but when faced with the so-called "uncle emperor", I was at a loss...