Normally, someone with zero basic knowledge like him, if he went to apprentice at one of those prestigious martial arts schools, wouldn't even get to learn any Inner Strength or Qinggong in the first two years, let alone learn many moves. It's highly likely he would still be doing menial chores.
Of course, if you "have a background," that's another story. Take Lei Buji from the previous chapters, who was sent to "Ba Fist Sect" by his old man, for example. The treatment of such "martial progeny" would definitely be quite different from that of ordinary disciples, but that's another story altogether.
We will see Lei Buji make a reappearance in the later chapters of "Six Kings vying for dominance," and we will discuss him further at that point.
But let's get back to Sun Yixie...
When he left the Southern City Military Department, it was close to midnight.
Even in the Capital, at this time of night, most places were already pitch dark and silent.