Su Wan was completely bewildered and blurted out, "You're saying my mother tricked someone out of a whistle and used it to run away..."

Zhang Ying was amused by her and said, "It's just that we're missing a beast-taming whistle, so I didn't think much of it and didn't bother to make a new one. If we were to make one now, it would probably take more than ten days. Didn't your mother give you that whistle?"

Su Wan's heart stirred, and her consciousness swept over the dowry chests in the apartment.

If this thing were very important, Mother would never have lost it; she would have brought it to Youzhou.

Scanning all the dowry chests with her senses, she indeed found an exquisite bamboo whistle.

She had previously stored her dowry chest in her apartment and never intended to open it. She believed that these things belonged to her younger brother, Su Yuze.

She held up the whistle: "Is this it?"

Even operating rooms in her time had surveillance equipment, and she believed that Zhang Ying's place must have it too.

Zhang Ying said, "Yes, that's it. Your mother really didn't throw it away."

"I thought it was a child's toy." Su Wan withdrew her hand and examined the whistle in her hand. "What kind of wild beast can this whistle summon?"

Zhang Ying said, "You'll see for yourself later. It should have returned here a long time ago, probably in its nest on the mountaintop. Nineteen years have passed... It's probably over forty years old now, quite old, but it's still more than capable of carrying you. Come on, I'll teach you how to whistle."

The method of blowing the bamboo whistle is quite complicated. Zhang Ying was very patient, and Su Wan also spent a full hour and a half to learn it.

Zhang Ying said, "I'm very satisfied that you agreed to let me extract the life factor. Consider this a gift from me."

Su Wan became even more curious after hearing this, wanting to know what this would attract, and said, "I'll blow on it when I go out and see?"

Zhang Ying said, "It's best to play it on the mountaintop. It's old, and it probably can't be heard from a distance."

Su Wan tied the bamboo whistle to her wrist with a rope, turned to the side and looked down at Wei Jingzhuo. Wei Jingzhuo had his eyes closed, as if he were asleep.

She gently kissed Wei Jingzhuo's forehead, thinking to herself, "Ah Jin, I'm sorry to trouble you to wait for me here for a few days. I will come back to find you as soon as possible. When you wake up, you must pamper me properly."