Going Back in Time, There Is No Train

He spent his whole life building a time machine, and finally succeeded before his death. When his son asked him which year he was going, he said, "Before your mother marries me." The son was stunned. He said, "I want to tell her, don't marry me, marry a rich man, and don't suffer from me." The son cried and said, "Mom's greatest happiness in this life is to marry you." He smiled: "I know, but I just want to say sorry to her in person." He pressed the button, but the time machine did not move. The son later discovered that the machine was just an empty shell. He just wanted to use this excuse to tell his son what he had hidden in his heart for a lifetime.