Core idea: A modern special forces instructor travels through the late Qin Dynasty, starting as a prisoner in Lishan Mountain, struggling to survive and protect the people in the torrent of history.
The three words "Lishan Prisoner" point out the protagonist's starting point (Lishan prisoner), identity dilemma (alien in the institutional cage), and the sense of struggle throughout - he is both a prisoner of the body and a prisoner of the times.
