Gou Is a Demon Lord in a Fairy Sect

I have the sword of quitting my hometown, its jade edge can cut through the clouds. A wanderer in Xiangyang is full of energy and spring. The light of the sword is too quiet in the morning, but the flowers of the sword are too cold in the evening. He can hold a sword against others, but he doesn't know how to hold it to himself. This book is also called "Being an Undercover Agent in the Immortal Sect"