Guard Him Secretly, Just Want to Protect His Wife and Become the Emperor

Lieutenant Shen Du of Leng Palace awakened the [Shadow Guard System]. By guarding the little palace maid, he can redeem his magic power and take revenge on the dynasty that destroyed his family. He originally regarded her as a tool, but she became the only light in his dark life. When the system's final mission is released, he faces a choice: subvert the world, or protect one person?