When Shen Zhixia was sorting out the wardrobe in her rental house, she found a fingerprint that did not belong to her hidden deep in the wardrobe. There was also half a piece of faded blue cloth stuck next to the fingerprint. She tried to trace the source of the fingerprints, but unexpectedly contacted Su Yan, the former forensic doctor who was in charge of her mother's disappearance case. The two dug deeper along the fingerprint clues and discovered that the fingerprint was related to the unsolved case that Su Yan handled three years ago and the disappearance of Shen Zhixia's mother. The strange noises in the old building, the evasive eyes of the neighbors, and the strange traces that appear repeatedly in the wardrobe draw the two into a whirlpool of secrets that spans many years. The wardrobe seems to be the key connecting the past and the present, and every wood grain hides the truth that has not yet been revealed.
