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This is not just a novel. This is an invitation. You are invited to board this lonely boat called "Eternity" and travel with fifteen watchmen. To feel the romance of a thousand years, to experience the pain of losing a loved one forever, to watch civilization bloom and die like fireworks, to think about what is worthy of lasting forever where all things end. Until you become part of this vast echo. "Cosmic Echo" - Witness all ephemerality and make it eternal over millions of years.

In 516 BC, Laozi left Hangu Pass and wrote the "Tao Te Ching" five thousand words later, but he didn't know where he ended up. What is not recorded in the history books is that he divided the "source of the great road" he had understood throughout his life into nine Taoist slips and hid them in nine secret places along the Silk Road, leaving behind a puzzle that spans two thousand years - Nine slips in one. Faced with the ultimate question that tortures human civilization - are you worthy of your own wisdom?

When "pollution" eroded the human territory like a silent tide, a team of forgotten "gravediggers" awakened a "Silent Beacon" that had been sleeping for hundreds of millions of years deep in the barren star belt. This was no accidental discovery. It is a carefully designed "invitation" that spans galaxies and takes light-years as the scale. Lin Hao, the only "interface" in the team who can resonate with ancient relics, has touched not only a lost navigation system, but also a key to the dark heart of the galaxy. What is connected to the other end of the key is the sleeping "Watcher", the last line of defense of an annihilated civilization, or is it a "mousetrap" for some older and more indescribable existence? Su Rui, the team's commander, must make a choice between safe evacuation or risking further. Xia Fanxing and Fang Rui reversely deduced the behavioral logic of the "beacon" from the massive data, while the medical officer He Lu monitored the increasingly clear "link" to the unknown deep in Lin Hao's consciousness. Every piece of data, every warning, every hint of intuition adds weight to the scale. This is not a simple exploration story. This is an archaeological journey deep into the dark heart of the universe, a logical game in the face of the absolute unknown, and a psychological confrontation with undercurrents under the stagnant surface. When the ancient protocol is accidentally triggered, and when the "key" and the "keyhole" begin to resonate, mankind is not only faced with a lost secret, but also the ultimate question about the fate of its own civilization: some doors, once opened, there is no way back.

Yungang City is a coastal city where prosperity and darkness coexist. The old streets in Wutong District, the skyscrapers in Xingang District, the abandoned factories in Bei'an District, the luxurious villas in Mid-levels - every place hides unknown secrets. Shen Yi, 45 years old, private detective. He used to be a criminal police officer, but he resigned due to the mysterious disappearance of his wife Lin Wan ten years ago, and he has been pursuing the truth alone until now. He is calm, perceptive, but particularly sensitive to cases involving missing women. His office is filled with files, and he always has a cigarette and an open window late at night. He thought he was looking for the truth. Until he discovered that behind all the truth, there is a pair of eyes. "The Tailor" - a mysterious figure who has never appeared, a ghost who plans high-intelligence crimes, and a trader who seems to know everyone's secrets. He is like an eye hidden in the dark, watching every case happen and every chess piece falling into the web he weaves. The last person Shen Yi's wife Lin Wan met before she disappeared was the "tailor"'s subordinate. After ten years, Shen Yi finally had a clue. But he didn't know how deep this clue would lead him to.