Zheng Qing had plenty of helpers.
Back in freshman year, as soon as he entered school he set up his own Knight Group and his own Hunting team. Among the rescued Sprites three Great Elves were born, and the shadow Su Shijun had cut off also broke out of the Two-dimensional World and became a Shadow Cat. On top of that there was the Yellow Flowered Cat his teacher had left him, the Obsession Little Green Snake that R'lyeh had entrusted him to erase, Giant God Soldier Taiyi and Primordial, as well as the relatively delicate-status Greenhill Mansion, and so on—one could say that filling all the departments of a newly established institution would not be much of a problem.
The problem was that this newly established institution was called the "Relevant Department."
The most secret institution within the Alliance.
