Hu Bayi and partridge whistle are looking for dust beads, not for longevity, but for survival.
The partridge whistle is Zagrama, and all people have genetic curses. This curse is that at the age of 50, they will die of blood coagulation, and no one can solve it. In the generation of partridge whistle, partridge whistle knew that dust beads could lift this curse, so he traveled all over Qian Shan to look for dust beads. This is the origin of people who moved mountain roads without seeking wealth but seeking elixir.
Hu Bayi is looking for a grain of dust, because he is cursed by the ghost eye. The curse of Ghost Eye is because it entered the ghost cave of Jingjue Ancient City, and the ghost cave has strong radiation, so Hu Bayi and others were infected, so they could only find dust beads to remove it.
Location:
According to the timeline in The Ghost Blows the Lamp, the dust beads were first discovered by Wu Ding, the 32nd monarch of Shang Dynasty, and then recorded by Zhou Wenwang in the gobbledygook.
At the end of the Qin Dynasty, this sacred object was found in the hands of the king of Yunnan in southern Yunnan, and later in the hands of Wang Xian, who took this pearl and hid it in the Worm Valley.
The dust beads that appeared after this, and the dust beads that appeared after this, are actually fake, which is why the partridge whistle found so many tombs but could not find them.