The Legend of the Tang Dynasty

The world only knows about the golden elixir avenue and the swordsmanship and boxing classics, but they don't know that the source of the world's martial arts and alchemy lies in the two strange books left by the old immortal Zhuang Zhou of Nanhua. One is called "Nan Hua Sutra", which focuses on internal studies; the other is called "The Tai Ping Sutra", which focuses on external studies. According to legend, if you are lucky enough to obtain two sutras, and practice both internal and external body and spirit together, you will be able to shed your mortal body and attain immortality when your practice is complete.