Leo didn't know the Emperor's real name, but he knew his nickname from the novel. The Sly Shadow, someone who controlled the Empire from the shadow and was actually crazy enough to leave the surface affair to his subordinates. That kind of someone could make Ming Yuchan nervous.
"Please, I am no Emperor." The Emperor shook his head and laughed, "Just call me Sheng. No need to be formal with me. Besides, you're not a native here, are you? There is no need to honor me as I am not your ruler."
"True, but respect is earned and not something you're born with. I know what you did for your country, and you have my respect for that. So I shall call you Master Sheng. Is that fine?"