Wang Zijia did not meddle with too many memories, only slightly modified those regarding the most profound memories of the Devil Gate, as well as the occasional teachings, imparting of spells, and training by the Ghost Spirit over the years.
He set up the memories of the Devil Gate as a life of hardship in a small mountain village, where he was discovered midway by Elder Zhang Daoling of the Wanyu Sect's hidden faction and was brought back and personally taught by him while becoming a member of the hidden faction.
Then the teachings of the Ghost Spirit over the years turned into that of God Monarch Zhang Daoling. Throughout this process, Wang Zijia took full advantage of his subjectivity for a meticulous addition of details.
To test the impact on human will, Wang Zijia even added some of his own stuff, adding many strong memory pictures to evoke emotions and distort thinking.