At the Beginning, an Envoy Came to Visit, and Half of the People Died as Soon as They Entered the City.

In the late Tang Dynasty, an Arab envoy went to the Western Regions. As soon as they entered the city, they were brutally attacked by assassins. The envoy of 200 people was killed by 30 assassins, causing heavy casualties! Too bad! Datang fell into a diplomatic crisis. How should Cheng Yuan, who accidentally traveled to the late Tang Dynasty, solve these problems...