The title of this article is actually the four big characters that made my heart beat when I happened to excerpt some passages that seemed worth keeping.
Or, these simple words just describe the life style in my heart, the atmosphere of the story, peaceful but not dead water.
The calmness of life, perhaps, is actually the result of inner restlessness. He and she in this world cannot be copied, and neither you nor me in reality can be replaced. Isn't it?