I know some friends, both male and female, who are always carefree and happy. It seems that endless good things happen to them every day. It was not until I got to know them thoroughly that I realized that not everyone who seems happy really lives in happiness every day. They just learned to hide all their sadness and unhappiness. They also have times of pain and sorrow. Even their lives are more unlucky than ours, but they always try to face us with a smiling face. I know that I cannot intervene in their previous lives, but I hope that their future lives can be treated gently by the world.