Gu Feng, a former ace detective who went into self-exile due to the sacrifice of his partner, can only rely on his "hyperamnesia" to chew through old case files. Lin tide, a silent girl who buries her past in an antique restoration shop and can sense the "emotion of death" through touch. A resurfaced unsolved case brought a broken music box to the two of them. He sees through her secrets, and she touches his abyss. When logical reasoning and emotional fragments are spliced together, the dusty truth and fiery redemption are revealed simultaneously. They are "co-sinners" cursed by the past, and they are also the only visible ray of light in each other's darkness.
