On a rainy night, there was a subway accident. Yu Xi woke up from a coma and found himself in a fluorescent forest. The door-shaped mark on his wrist was faintly hot, and the "Book of Mountains and Seas" in his arms turned without any wind - the old book left by his father was now guiding him into a world that did not belong to the human world. Twelve crossings, twelve mouthkeepers, twelve trials of life and death.
Lu Shu hides the key to memory, Gluttony devours everyone's real names, Jian demands old debts that cannot be repaid, Qiongqi reverses the boundaries between good and evil, Jiuying distorts the most precious memories, Gudiao tortures the quality of the soul, Yinglong is trapped in the betrayal ten thousand years ago and cannot escape, Xiangliu ecstasy with nine poisons that eat away at the bones... Every crossing is an anatomy of human nature.
Yuxi is not alone. Lin Yu, a folklorist who has lost his memory, Song Jiang, a knife loaner who bears the blood debt of his family, Tu Xu, a forensic doctor with sin-stained hands, Feng Guizhi, a veteran allergic to time, Chu Ru, a silent 16-year-old boy, and An Li, a mysterious woman whose name has been erased - the seven people travel together and struggle to survive between ferry crossings. Some people fall, some people forget, and some people become what they fear most. The rusty scissors in Yu Xi's hand can cut off the shadows of all things, but they can't cut off his own destiny - "Those who have silhouettes will lose fifty years of their life."
Twelve crossings, twelve passes of life and death. If you can cross it, you will be on your way back; if you cannot cross it, you will be an eternal prisoner. But even after crossing all the ferries, is what is waiting for them really going home?
