Bound to Fuyun Sect, I Am the Soul of the Sect

In the world of immortality, there stands a supreme sect: Fuyun Sect. But the origin of Fuyun Sect starts with an old casual cultivator and a time traveler with a system. (This book will be as non-brainy as possible. If there are any brainless parts, please feel free to give me some advice. You can listen and make changes.)