Taoist Heroes of the Sui and Tang Dynasties: the Legend of Qin Xiu

Qin Xiu, a great disciple of the Wudang Sect, mysteriously traveled to the Sui Dynasty after failing to hold the elixir, and transformed into Qin Qiong's cousin. He reentered Taoism and founded the Wudang Sect, solving the problem of the loss of training methods in the Qin family. He also carefully forged Qin Qiong, a tiger general, and helped him join Li Shimin's command. On the way to the rise of the Tang Dynasty, Qin Xiu shuttled between the battlefield and the court with a mysterious Taoist identity. While assisting Li Shimin in his southern and northern wars, he skillfully maneuvered in the power vortex between the prince and the King of Qin. When the Tang Dynasty came to dominate Asia, he suddenly disappeared. What is Qin Xiu's purpose? Why did he retire after his success?