No matter how many years pass, what becomes a regret will never be forgotten.
If she could do it all over again, she would definitely choose to make up for it. This period might not be fruitful. It was a youth that belonged to her and him during her college years.
Before rebirth: I didn't catch it back then, and the person involved regrets it now.
After rebirth: I don't regret it that much. Can I still go back now?
Purpose: I hope every relationship that ends will leave no regrets.