Central Continent is filled with numerous sects, unlike the clan-based system of Southern Border.
In clans, relationships are maintained through kinship, and clansmen are cultivated as family. But in sects, the master-disciple relationship replaces blood ties. Sects widely recruit disciples; as long as one has aptitude and character, they can be accepted into the fold.
Precisely because of this, Fangzheng was able to be absorbed into Immortal Crane Sect and become one of its members.
Chapter 335