This Undercover Agent Jumped Repeatedly

(Travel, group portrait, upgrade, no system) Liu Xi, who had been an undercover agent in a criminal gang for five years, suddenly traveled to another dynasty and became a double agent for the rebels and the court. I originally thought that this status was good, after all, it was a professional counterpart, but unexpectedly, the two people on both sides of the line were indifferent and forced him to give him an impossible task. Liu Xi did not insist on following the task, he chose to let his superior disappear from the world. As a result of the killings, his position on both sides rose higher and higher, and he became a mysterious ace mole in the eyes of others. And he also discovered that he became stronger after killing people? Isn't this the world of martial arts? Why do you feel like you are cultivating immortality?