The clue of the article refers to the clue that runs through the whole article and supports the theme of the article. It is usually the part that can best express the theme of the article and is also one of the most important elements in the entire article. Happiness is a flower blooming in life. The clue of this article was the author's perception of life and happiness. Through describing the protagonist's growing up experience and his perception of life and happiness, the article shows the importance and value of life and the author's understanding and pursuit of happiness. Therefore, readers can understand the author's view on life and pursuit of happiness through the clues of the article, and then better understand the main purpose of the article.