In a world shrouded in eternal "ember fog", human beings rely on the guidance of floating lighthouses to survive on the established route. The lighthouse keeper Lin Mo, a lonely man who is burdened with the mystery of his family's disappearance, repeats boring tasks day after day. Until one day, a mysterious woman named Fei broke into his world with a broken ancient star chart. The star chart pointed to the "Lost Route" that was tabooed by the "Administration", and also touched Lin Mo's dusty memory. In order to explore the truth behind the disappearance of his father, and to uncover the secret of the world wrapped in lies, Lin Mo decided to join forces with Fei, driving an old airship to the legendary sea of annihilation that no one dared to touch.
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