When we were young, we stumbled along the way, with a small life circle and small thoughts; when we are no longer young, we occasionally miss the old times and miss the memories that we carefully treasure. The people who are still around, the people who have gone away, and the people who are about to come constitute our destiny. We know that if we change a little detail, life will be completely different, but we cannot predict whether the final result will be happy or sad, similar to Lola Run or the Butterfly Effect, but ordinary us only have ordinary stories to tell.