After a thorough search, Zhou Chun and his companions did find the identity of the faction that built the secret treasury.
According to the alchemy notes left by an alchemy master within the alchemy inheritance, he should have been a cultivator of a sect named "East Sun Sect."
This "East Sun Sect" was a cultivation sect that was wiped out a thousand years ago in Cheng Country.
Unfortunately, there is not much recorded about the "East Sun Sect" in the Zhou Family's library, only that this cultivation sect probably never produced a Nascent Soul Stage Cultivator, thus it was not considered a true major power.
A thousand years ago was a tumultuous era for countries like Jingguo Country, Fengguo, and Cheng Country, during which many such cultivation sects and Golden Core families were exterminated.
