87 Letters From The Family

To Han Cai, the blood contract sounded demonic. Han Cai liked to represent himself as pure-hearted person. 

As a pure person, he liked pure-sounding techniques and methods. In general, most of the techniques or methods related to blood were considered demonic in this world. 

Han Cai asked the system if there was any better version and cheaper contract method like a blood contract but not cheap and demonic sounding like a blood contract or beast slave mark so he could have a clear conscious while making someone his slave.

The final option system gave him was something called a soul contract. This contract was a bit more expensive, but it directly binds the soul of the person to your soul. To Han Cai, it sounded a bit more classy compared to the beast slave mark and blood contract.

Soul contracts already exist in this world. It was not accessible in the northern region but was mostly used in central regions.