In the ninth year of Daye, Emperor Yang of Sui launches his second campaign against Goguryeo, and a million troops are trapped beneath the walls of Liaodong City.
Supply lines are repeatedly cut, military intelligence leaks one after another, and an ominous atmosphere hangs over the eastern expeditionary camp. Someone is passing information to Goguryeo.
Yuwen Shu is ordered to investigate and unexpectedly uncovers a secret intelligence network spanning thirteen provinces of the Sui Empire. At its center is a mysterious figure known by the codename “Xu.”
At the same time, in an abandoned village outside Luoyang, a young woman with no memory is rescued by a hunter. Hidden at her waist is a strange bronze token engraved with an undecipherable code. She writes with her left hand, but her handwriting is a mirror image, running from right to left.
She doesn’t know who she is or why she ended up there.
But she knows one thing: someone is hunting her.
Behind the hunt lies a shocking conspiracy capable of overturning the foundations of the Sui Empire.
As war engulfs the Central Plains and imperial authority teeters, who is secretly weaving this web of spies?
It all begins with a forged secret letter.
