The talented pianist Shen Yubai suffers from "heart erosion syndrome", and his heart gradually crystallizes and fails. Lin Wan, his perfumer girlfriend who loves him deeply, discovers from mysterious ancient books that she is the only one who can make the "heart-yining" potion that delays crystallization, but the potion is actually her "purest and most intense love", and each time she makes the medicine, it will violently consume her vitality.
Lin Wan chose to become a "living medicine pot", concealing the price, enduring the severe pain of vomiting blood and the loss of life, and integrated her love into the medicine. Shen Yubai's career improved and he returned to the top, but he became suspicious of Lin Wan's health and secrets. In an accident, he bumped into a pharmaceutical production site and witnessed the inhuman torture Lin Wan endured. Torn apart by shock, guilt and anger, he refused to take the medicine and his condition deteriorated rapidly.
Love and pain intertwined, Lin Wan held on. After a conflict, she was shocked to realize that the medicine was ineffective due to love mixed with resentment. Shen Yubai is on the verge of death and declares the fragility of "using love as medicine". The forbidden technique of "Heart Transfer" appears in the final chapter of the ancient book: when the other party is willing, one party must carve out the heart and sacrifice it before the crystallization is completed, exchanging lives for lives.
Shen Yubai, who was dying, found Lin Wan in an abandoned church who wanted to perform forbidden magic alone. He took the dagger and confessed affectionately: "Your love has become the poison that keeps me alive. This time, it's me who will free you." When he was about to stab himself, Lin Wan tried his best to stop him. In the chaos, Shen Yubai fell ill and collapsed. Holding the dagger in hand, Lin Wan faced the ultimate choice: cut out his heart to save him, or embrace him and fight to the end together? Looking at her lover's sleeping face, the dagger clattered to the ground. She hugged him tightly and waited for the unknown dawn. In the morning light, Shen Yubai's weak heartbeat was still there, and what Lin Wan held tightly in her hand was the bottle of "heart" that symbolized immortal love but had expired.
