Every time I look back at the past, I feel a sense of oppression. If we smile when we look back, people call it memory. If we are painful, people call it regret. After a long time, regret will fade away in our hearts, and then become memories that will stay in our hearts forever. In fact, being calm is not because you are strong, but because you have learned to pretend. Indifference does not mean not caring, but fear of getting hurt.