I Was Sacrificed at the Beginning, and When the System Received My Account, I Killed Them Randomly!

(High martial arts + system + no heroine + demons in troubled times + decisive killing) Li Yuangang, who had traveled through time, opened his eyes and found that he was about to be sacrificed to the river god. Just when I was desperate, there was a 'ding' and the system arrived! Are there different rewards for killing monsters and monsters? What! Evil people who commit many evil deeds are also demons! Jie Jie Jie! Li Yuan sharpens his sword, kills evil people, kills demons, and creates a bright future! The world is at peace!