Before we begin, imagine a dying person. He has no surname, no clan, no clan, but because of a single thought, when his chest rises and falls for the last time, he divides his last breath into two parts: one goes down, and the other goes up. That breath was not air, but his life's unfinished regrets - countless "if only" and "I could have" - they were like two convection undercurrents, entangled with each other in the void, and finally condensed into substance. What sinks downwards turns into eight seas of suffering; what rises upwards condenses into nine upside-down mountains. Once the mountains and seas are formed, the thoughts of all sentient beings will have shape and weight. As a result, the world is no longer a geography that carries all things, but a huge medical record, recording every disease that is "unobtainable" and "cannot get rid of". People call it: Nine Mountains and Eight Seas
