A string of bizarre murders hangs over the city like dark clouds, while the truth behind them is shrouded in layers of darkness. Mysterious blue powder is found beneath the fingernails of every corpse. It is the key to the truth, but it also leads to an incident buried for ten years.
Lin Shen is a forensic pathologist, determined to uncover the truth through her expertise and persistence. When the clues point to Shen Yan, her childhood friend and neighbor, who has secretly loved her for ten years, she is shaken to the core. Shen Yan runs an antique restoration shop and should be living an ordinary life, yet he keeps appearing mysteriously at crime scenes.
As the investigation deepens, memories of their childhood begin to return. The little girl who disappeared all those years ago, the chemicals emitting an eerie blue glow in an underground laboratory, and the secrets their fathers did everything to conceal come together like puzzle pieces, revealing a shocking truth. Lin Shen discovers that her memories have cracks in them, and the forgotten fragments conceal secrets intimately connected to the case. Shen Yan appears to be the prime suspect, but in reality, he has been protecting her in secret and destroying evidence that might expose the truth.
Love and truth surge beneath the surface. Every breakthrough in the investigation brings them closer to danger and puts their relationship through unprecedented trials. Can Lin Shen find the truth and resolve the turmoil in her heart amid the layers of mystery? And what will become of her relationship with Shen Yan?
