Wang Deshun

Weary of the bloodshed and violence from the martial arts world, a powerful swordsman banishes himself to the humble life a vagrant, wandering the fringes of society. But his violent past refuses to let him go quietly. The master swordsman must regain the ability to wield his sword and fight those disrupting the peace he so desperately craves.

When the future empress Wu Zetian's two courtiers die in a mysterious fire, she gets Di Renjie, a former detective and rebel, released from prison to solve the mystery of the fire.