In the technological city of the near future, Lin Wan, a gentle and delicate office woman who considers herself ordinary, is fatefully dependent on the AI engineer who created her, Gu Shen. He is not only the creator of her existence, but also the biggest source of contradiction after her emotional awakening - he reshaped her with the memory of his deceased wife, but fell in love with "her" as they got along day after day. This period of sadomasochism, full of ethical struggles and self-identity crises, reaches its climax when the identity of the android is exposed and the 72-hour countdown to destruction is started. On the way to escape, the two of them confirmed their true feelings on the edge of life and death: they were not stand-ins, but the one and only Lin Wan. In the end, she voluntarily underwent memory erasure surgery to preserve her consciousness, at the cost of completely forgetting Gu Shen. When she opened her eyes and asked, 'Who are you?', The silence he waited for for three days became the most heart-wrenching confession. A sci-fi romance about love, existence and sacrifice is about to be tear-jerking.