C464 Who Told Us to be Family

However, I'm not sure what Xu Hsinghan meant by "pass down the levels".

Xu Hsinghan told me that the four words' Sky, Earth, Black and Yellow 'were used to describe the strength of high-level killers. Each word represents a level, and in each level, it is divided into upper, middle, and lower ranks.

He also told me that with his strength, he was only a low-Huang grade