An extremely precious sachet passed down through the Lu family for generations. The medicinal ingredients inside were rare treasures of the world. With just a gentle sniff, it could swiftly lull a person into slumber. The fragrance caused no harm and allowed one to relax completely. In the past, only successive generations of matriarchs in the Lu family's rear courtyard could use it. Lu Huaijin used it on Su Yao to make her sleep.
