They have very different personalities, but they have become an inseparable part of each other's lives since high school, as if destined. When their love and friendship conflict with each other, where should they go? A sudden change revealed all the truth, but everything was irreversible. Su Xue, if there is an afterlife where the three of us are the sisters and you are the sister, let us repay the friendship you have shown us in this life together. We agreed that in the next life and the next life, the four of us will be good sisters and we will always be together. This is our story.