The Empress of Yue's Best Friend

She took out the medical book left behind by her mother from the drawer and flipped to the last page. She placed the two books together and realized that the patterns in both books were the same. They were only half-drawn. When put together, it formed the image of an auspicious cloud.

"What's going on?" Su Yingxue's heart was pounding intensely.

"Princess, you mentioned that you brought this book from the Yue Kingdom's imperial palace. How did the Yue Kingdom's imperial palace obtain it? This pattern... Do you know what this pattern represents?"

Su Yingxue hastily pushed the two books in front of Sheng Ping and asked urgently.

Sheng Ping was also somewhat puzzled. "This book has been cherished by my mother. I've seen this pattern before. When I was young, my mother mentioned that she and her close friend drew this together. They each contributed half of the drawing. On every book that my mother owned, this pattern would be depicted."