Emperor of the Late Sui Dynasty

The bed board made a "creak, creak" sound. The dim oil lamp made the whole room feel inexplicably depressing. It was still a sunny afternoon outside, but the room felt like another world. There are no windows, and the walls are not very soundproof. You can vaguely hear the chirping of birds outside. The emperor's eldest son, Yang Yan, looked stupid, staring at the surrounding scenery in a daze. This was his fourth day in the Sui Dynasty. ………………………