When he closed the book of heart, Feng bujue fell into deep thought.
He knew very well that the reason why fate had chosen this method to let him know about the erased memory was to prevent this matter related to "memory adjustment" from entering the strange circle of trust.
For example ... If fate showed the memory to brother Jue directly, or requested for him to transfer the memory through physical contact, then there was the possibility of 'even this memory being fake'.
This "possibility" that could not be verified, whether positive or negative, could ruin the entire plan.
Therefore, fate had used the book of heart.