The Sword Controls the Heavens

This is a story about a pair of siblings who wield swords and travel across the world. Lin Xiuran and Lin Zixian accidentally obtained the twin system, and began to travel through various planes. Anyone who betrays me will be killed! Anyone who is my enemy shall be killed! Anyone who prevents me from becoming enlightened will be killed! Use the sharp blade in my hand to cut through any obstacles in front of me! In the end, Lin Xiuran also discovered a huge secret... [Single female protagonist, don't squirt if you don't like it]