Wei Zi knew.
Matriarch Yu had to order someone to give more than half of the incense, medicinal tea, and other items that the Yu Residence had given in return to the heir.
The things that the Heir usually ate were gradually changed to incense and medicinal tea made by Eldest Miss Yu. After using them often, he experienced the benefits. Gradually, he was used to them.
The Matriarch had used this method to silently fill the Heir's daily life with Eldest Miss Yu's bits and pieces, making her a figure that could not be ignored.
