From the Start, I Kill My Boss and Awaken a Short-Lived System!

Jiang Xuan transmigrated into a vast fantasy world, only to discover that he was a spy planted in the government by the Demon Cult?

All promises, no benefits?

Fortunately, he had a System. Once activated, it could instantly turn him into an expert. The catch was that activating it required him to kill his immediate superior!

Thinking of his two bosses left him at a loss. One was the government’s upright head constable, who punished evil and upheld justice. The other was an elder of the Demon Cult. Which should he choose?