Zhao Heng grew up in an unknown ancient town, but his soul resonates with a shadow that has disappeared for a hundred years. Every ten years, on the ghost night of the old calendar, he would be awakened by a strange black mist and embark on the road to the underworld, chasing the woman whose face he could never see clearly. Is she an unfulfilled promise from her previous life, or is she a reflection in the abyss of fate? Zhao Heng traveled through dilapidated archways, abandoned post roads, and haunted houses eroded by time. Every step he took was filled with resentment and care from the past. He longs to unravel the inextricable connections between himself and the shadow, but gradually discovers that his own existence is the key to the mystery of the century. When chasing turns to being chased, Zhaoheng is forced to face his forgotten past and the cruel laws of the netherworld. Death and survival, forgetting and remembering, resentment and redemption are intertwined in the long river of time. Can Zhaoheng break away from the chains of the netherworld and find his true destination? With a poetic and cold writing style, this book outlines a soul pursuit that spans a hundred years, and offers a dark night elegy to the lonely souls in the world.