Reincarnated as a Casual Cultivator, the System Asked Me to Fight Against the Sword Demon

There are eight major sword sects in this arena: Yin Yang, Wu-Self, Asking Heart, Hunyuan, Kongyi, Divine Envoy, Junlin, and Ghost Spirit. As soon as Li Tianzhen was reincarnated into a stranger's body, he was involved in a murder case. The system that was awakened later treated him as a beast, constantly sending out brain-burning tasks, and threatening to drive him to pieces if he failed to meet the quality and efficiency assessment targets. One mysterious case after another pushed him to go on non-stop. It is true that "people are in the world and can't help themselves." He suddenly discovered that the enemy he was about to face as an unknown cultivator was actually the legendary Underworld Sword Demon! The truth, what is it! ?