In the noisy and alienated modern city, Lin Yushi, a gentle and delicate woman with amnesia who is deeply involved in the mystery of her identity, reunites with Gu Han like fate. He was both her guardian for three years and the prisoner who trapped her in the shadow of the dead. This sadomasochistic relationship, which began with deception and was wrapped in guilt and obsession, suddenly collapsed when a red dress and a secret phone call at 0:37 were revealed. When Lin Yushi faced the soul torture of "who am I?", Psychiatrist Jiang Cheng became her guide to the truth. In the vortex of memory fragments and emotional entanglements, Lin Yushi must break free from the shackles of "substitutes" and find his true self; while Gu Han must make a choice between obsession and redemption - whether to continue to indulge in the phantom of the deceased, or to bravely embrace the living lover in front of him. An urban emotional suspense drama about love, forgetfulness and rebirth, it is about to tear away the gentle surface and go straight to the softest and most painful part of the human heart.