Soul Contract: Spirit Contractor

3,000 Years ago, something strange came to the world. Within a hundred years, humanity was slaughtered to only one-third. The remaining countries around the world built high walls to isolate the outside world to ensure the safety of the survivors. And 200 years later, a group of people awakened strange powers and broke out of the high wall to eliminate the strange things. Although they suffered heavy casualties, they also regained some land for mankind. The power awakened by these people was called "Qingling" So these people are called spiritual contract masters...