Out of control mayhem, cannibalistic instincts...
I couldn't imagine Changan turning into a demon that attacks humans, but ultimately, the reason he was sealed by the Zhu family in his childhood was that he had lost control before.
As a friend of Changan, I couldn't help but care, "You've mentioned before that Changan's demon side had gone berserk... What exactly is this 'demon side'?"
"Well, how should I put it..." Zhu Shi seemed to be choosing his words, "In layman's terms, it's somewhat like a second personality?"
Even the term "second personality" had come up. Were your siblings' concepts in "that aspect" a bit too rich?