I Thought It Was the Tang Dynasty, but Who Knew It Was Journey to the West?

The protagonist Su You travels through the Tang Dynasty, and his predecessor was drained of yang energy by a vixen and died. Su You discovered that the world is full of demons and ghosts, so the King of Tang asked Monk Tang to obtain scriptures to purify the world. After Su You had the krypton gold system to become stronger, he chose to use krypton gold to become stronger. He kept the beautiful ones for his own enjoyment and killed all the ugly ones.