She is Wen Jin, a gloomy and taciturn organizer of relics, who has been with the deceased all year round. The tragedy of her family's destruction in her childhood trapped her in the darkness, making her cold and alienated, and filled with deathly silence.
He is Xie Xun, the abstinent and slow-tempered leader of the serious crime team. He is rational and rigid, not close to warmth, and only believes in logic and evidence.
A serial relic murder case suddenly comes, and the strange marks on the scene all point to Wen Jin's bloody past that has been covered in dust.
He went from being on guard and questioning, to silently guarding her. He was slow to move but fell deeper step by step; she was on the edge of the abyss because he touched the only glimmer of light.
The real murderer behind the scenes is approaching step by step, and the truth about childhood is revealed in tears. At the end of the darkness, the two find each other and salvation in the ashes.