The Background Was so Invincible That the System Was so Scared That It Was Forced to Upgrade.

Zhang Zifeng traveled to a fantasy world where the strong were respected. He thought he was going to live a wandering life. Fortunately, he had awakened the system, which was a blessing among misfortunes. However, Zhang Zifeng suddenly realized that something was not quite right about the system? Yesterday, I signed in to only improve my cultivation. Today, I also gave away a skill? What, you want me to find a great emperor ruins to sign in next time? System, did you send too much? However, what Zhang Zifeng didn't know was that in the void that he didn't know, a shadow was frantically wiping away sweat. "Do you think I want to upgrade? I'm forced to have no choice!" Xuying let out a long sigh. Just because the local dog who likes to rub Zhang Zifeng's trouser legs is a demon emperor! And the only maid beside him is a powerful sword master transformed into a water spirit! "The little master seems to have an extra breath on his body. Do you want me to eat him?" Tugou said. "No, the master asked us to accompany the young master for training. We just hope that he can increase his knowledge. If that aura can bring enough benefits to the young master, we will keep him for the time being." The maidservant replied calmly. Zhang Zifeng kept all this in the dark until one day, he discovered that the four masters of this world were all polite to his maid...