"On this day last year, in this door, the human face and the peach blossoms reflected each other's red. I don't know where the human face went, but the peach blossoms still smiled at the spring breeze." Time always likes to leave people behind silently, and then calmly tell that person, "I have left you." When the poor man turned around, he realized that he had been abandoned by time and could only drag his old and tired body to continue moving forward in the desolate place where things and people have changed.
This is the saddest thing I think.