At the beginning of the Sui Dynasty, Shuangmu, a young thief in Chang'an City, accidentally met the mysterious immortal Lin Xi. As they walked together, he gradually discovered that there was a half-soul who was constantly targeting Lin Xi. While exploring the identity of the half-soul, the past and future lives of Shuangmu and Lin Xi are also slowly revealed. [The side story is the main body, and other stories are narrated in large lengths]