The Bridge Is Two and a Half Days Away

It doesn't matter whether At has had a long dream or whether he has actually experienced death and rebirth. What is important is that he understands that he is the link between his parents and understands that the reason why people miss the past is because of the unsatisfactory present. Even if a time machine takes you back, you are just a bystander watching the good things before replaying. It is true to miss, but what you need to do is to do your best to change the unsatisfactory present.