Seven years ago, Lu Qingci picked up a concert ticket stub and didn't know who lost it. There are four words printed on the ticket: Stay safe.
Seven years later, he learned that He Ran's mother passed by this street that day, carrying two tickets. One was given to her son, and the other was dropped.
Like some kind of prophecy. They borrow each other's youth and then get separated. It will take another nine years to return the midsummer.
"He Ran, you borrowed it that summer."
"Yes. I will give it back to you in this life."
Intention: Love means being willing to spend the rest of your life repaying that summer after we meet again.