You can see from the Axial Age in Chinese History timeline (PDF) that Shang Yang was born before Zhuangzi and died during his lifetime. Han Feizi was born six years after Zhuangzi’s death.
This was the latter half of the Warring States period (475-221 BCE):
In this conflict it was the northwestern state of Qin that rose to dominate the North China Plain:
One other note and question: This is the first (but not last) time we will encounter lurid details amid a highly-personal account of how power works. To what extent does this framing of history make sense to you? To what extent does it seem to fall short of giving us the full picture?
The Hotchkiss Law Code
Examples from Qin law code: