C44 Discover febrile disease

The next morning.

In the Battle King Manor's bedroom, Xuanyuan Zhan got up from the bed and sat on the bed as he said politely, "It's all thanks to you helping this duke this time. Otherwise, this duke wouldn't even know what good idea I would have made."

Xue Leng felt uncomfortable after hearing Xuanyuan Zhan speaking to him so politely. "My prince, this is a duty