Bai Wanxing knew that he was heading towards death.
But Shen Wudu had already given up on living.
An unexplainable body swap forced them into each other's lives——
For the first time, she had a healthy body, but could only borrow it briefly;
He feels the weight of life for the first time, but must learn to bear it and stay.
In exchanges again and again, they understood and relied on each other, and gradually realized:
This is not a miracle, but a countdown.
When interchange begins to fail, when separation becomes inevitable,
They must answer the same question -
If you are destined to lose, should you become another person's world?
This is a story about life, love and farewell.