Missing is a kind of happy sadness, a kind of sweet melancholy, and a kind of warm pain. Missing is the long indulgence of yesterday and the longing for a better future. It is in the endless longing that people's emotions are purified and sublimated. Without distance, there is no missing. When the ship's whistle sounds, when the train whistle sounds, when the car's wheels start turning, when the plane rushes off the runway and takes off into the sky, missing you begins. It is precisely because of longing that we have the joy of meeting again after a long absence, the surprise of unexpected encounters, and the toasts of celebration when relatives and friends get together.