Evil Source would never have expected Lin Yuan to be able to remove her soul branding on the book.
She had only managed to place the soul branding on the book after thousands of years of slow and hard work. Even she would have struggled to remove it.
Evil Source had been waiting for Lin Yuan to ask her about the soul branding. When that happened, she would be able to take Lin Yuan with her behind closed doors to speak to him in either a humble voice or a pleading one when she requested to work together.
However, reality had floored her, and Lin Yuan had not given her a chance to do any of that.
Evil Source could be certain that not even Eternal Source could forcefully remove a soul branding!
Evil Source was terrified that Lin Yuan would come after her in the future. He even had the power to steal her book, which meant that he was more than capable of suppressing and keeping her down. How could she hope to compete with him?