Backtrace

If you could go back in time, would you be willing to go back in time as a stranger and change the ending of the story? Distinguished guests: Hello! Welcome to the "Lookback" headquarters, where everyone can only have one opportunity to look back in time, so please cherish it! Things to note are as follows: 1. You must present the "Invitation Letter" before entering "Lookback" 2. You can freely choose the time in your life that you want to look back, but you cannot choose major nodes or the day before your death. 3. You can only choose one person as your host, and remember not to reveal to anyone what may happen in the future. 4. During the lookback period, your true identity and other information cannot be disclosed to anyone. You can only use the name of the previous user as his code name. If your true identity is discovered by anyone, history will be changed in the future and history will be rewritten. The consequences will be unknown. No matter what the consequences are, you will be responsible for them. 5. You can only stay in the past for one month. After the expiration date, staff will automatically come to collect it. If necessary, please say goodbye to your host on the last day, but please do not disclose any information. 6. If you need to change history, please make your choice carefully. If the history change is successful, the memory of everyone except you will be automatically erased. You will be erased. If you fail, the consequences will be borne by your host. 7. Remember not to let anyone know about the existence of the "Lookback" headquarters Concept: If his (her) departure takes away all the storms in your world, then is it his (her) departure that takes away the storms in your world, or is there no storm in your world at all, but his (her) appearance makes your world more stormy?