In Dasheng, when the court wanted to kill a person, it did not need to use a knife, but only left an empty column in the roster. In order to investigate an old case in his hometown, Lu Zhiyao, an unregistered registrar, forged a marriage certificate and tied up Xie Cheng'an, the captain of the registry who was in charge of hunting her down. From using each other to committing suicide, the two eventually discovered that someone was preparing to wipe out the seven border towns, and Xie Chengan's father was the first signatory of this conspiracy.
