During the long holiday, my wife decided to go back home by taking a late-night bus. We had originally planned to go together, but unfortunately I couldn't make it, so my wife left alone. "This is my first time riding an express bus," she said, happily packing her bags. I sent her off by saying, "Well, have a good rest." That night, I was using the messaging app on my smartphone to contact my wife in the car, but...