To be honest, the fact that He Jingyi thought Ming Zixin might have probably stolen his foster father's talismans was not something excessive. It's safe to say, in the three realms, Ye Hu, his foster father, was the most hostile person towards Ming Zixin. And the reason was clear. Ye Hu knew the deal between this prince and his lord.
In this malicious world, it's not something special to see such secret deals between cultivators and demons. People only knew what they wanted and how to get it with ease. Since He Jingyi was a child of his lord, Ye Hu knew his child need to sacrifice this much..... like marrying someone for the benefits of her own father.
But what He Jingyi disliked and hated the most about this crown prince was that.....