A car accident ten years ago crushed Duan Ning's home and broke up the tightly interlocked hands of five teenagers. Guilt is like a moist mist that has spread over the ginkgo necklace that Shen Yao didn't give away, over the shipping bill that Lu Yanchen hid in the safe, over the tears that smeared in Su Wan's diary, and over Duan Ning's empty old house - they all hid their secrets in that rain, and used escape as farewell to each other.
Ten years later, Lin Yanqiu's plane crash was like a thunder, splitting open the scabbed past. The video she left on the USB flash drive became a belated reconciliation: "Don't hide away all the time. We all owe Duan Ning an apology."
In order to give her a final journey and to uncover the buried truth, the four of them reunited. On the way to track down Zhang Qishan, the "boy in blue uniform" in his father's diary, the unsent letter of confession, the oden cooking at the convenience store late at night, the darkness deep in the air-raid shelter... The secrets and emotions that have been soaked by time gradually surfaced in the moist rain.
It turns out that some farewells are never the end, but waiting for the rain to stop, for a group of people to turn around, and for all the unspoken "sorry" and "I like you" to finally fall gently on each other's shoulders in the sunshine.
