Yesterday's Administration

If you could change the past, who would you most want to save? This world cannot predict the future, but it has mastered a more dangerous technology - modifying the past. But history never corrects regrets for free. Every time a life is saved, other people may lose the opportunity to meet, be born, or even exist. When a happier world must be built on someone else never being born, who has the right to decide which life is more worthy of existence?