In Dijiang's understanding, a relationship like the one between himself and the Netherworld Overlord would normally be best formalized by taking him on as a disciple.
However, the Netherworld Overlord actually wanted to become sworn brothers with him instead, which truly left Dijiang baffled!
"Hahaha, there are some supreme rule secrets involved in this, so it's normal that you don't understand!"
Chapter 751