The Boss of the Opening Knife Awakens the Short-Lived System!

Jiang Xuan traveled through the fantasy world and turned out to be an undercover agent arranged by the Demon Sect in the Yamen? Just painting a big pie doesn't bring any benefits? Fortunately, the system possesses you. As long as you activate it, you can become a master immediately, but the prerequisite is that you have to kill your immediate boss if you want to activate the system! Thinking about his two bosses, he was in trouble for a while. One was the upright and upright chief of the yamen who punished rape and eliminated evil, and the other was an elder of the demon sect. How should he choose?