The "line of life and death" and the "line of memory" in the dungeon. Pei Huaiyu died and lost his memory time and time again in the dungeon. Song Jinshuang's love was repeatedly reset. This "finish line" became an obstacle that they could not overcome in their relationship. The "cannot cross" in the title of the book is not a pity, but emphasizes that their love has become stronger despite the obstacles of the "finish line":
Purpose: Cherish hard-won friends
