**A love between childhood sweethearts that spans twenty-five years, from ignorance in childhood to staying together forever, writing the deepest bond in time. **
In 1998, 5-year-old Su Wan moved with her mother to an old alley in a small southern town and met 6-year-old "King of Children" Lu Ze. A "rivalry" over grabbing candied haws on a stick led to the two of them making a promise "I'll protect you" under the old locust tree at the entrance of the alley. They grew up inseparable, hiding glass beads in a locust tree cave, and their hearts fluttered under the sunrise on their graduation trip, but they were separated for seven years due to family changes.
In 2017, fate reunited them - she was an editor at a publishing house and he was an architectural designer. The old alley is facing demolition, and the locust tree that witnessed their childhood will also disappear. When Lu Ze took out half of the safety rope that he had collected for many years, and when Su Wan took out the letter that had never been sent, they finally solved their misunderstanding, but they still had to face the challenges of the adult world: Lu Ze was afraid of repeating the mistake of his father's early death, while Su Wan was obsessed with the "stability" left behind by his mother's death.
From youthful ignorance to maturity and determination, it took them twenty years to understand that love does not mean that we will never be separated, but that even if we are separated, we will meet again at the fork in the road of life. When Lu Ze knelt on one knee under the old locust tree and used the melted safety rope ring to fulfill his childhood promise of "raising you", time seemed to close a loop - the boy who robbed her of her candied haws will eventually become the man she spends the rest of her life with.
**Classic Quotes:**
"What I want is not eternal change, but your willingness to face changes with me."
"I said I would support you when I was young, but now I want to change my identity - from the alleyway to the old age."
Concept: In the gap of time, love is the only constant coordinate