I Took a Nap and Woke Up Branded a Spy and Thrown in Prison

Because of the fiefdom system in the Donghui Empire, the feudal lords wielded enormous power while imperial authority steadily declined. The lords carved out territories for themselves, proclaimed their own states, and waged endless wars across the land. Yu Xiao was an ordinary modern-day security guard, but he unexpectedly transmigrated to a teahouse in the Tang State of the Donghui Empire. The Tang soldiers mistook his strange clothes for the garb of a spy and threw him into a dungeon. And so the story begins...