i personally think it might end in a loop with Tang YiXun sending the love letter to 1991. I hate loops though…
It's very hard guess. If something need to travel time it has to be inside the post box, at least for now this is only way. So, I don't think he traveled time. I had thought about different type of mystery. But episode 8 makes my every prediction invalid. After re watching the beginning of episode 1 I am more confused.
https://ww.kissasia.cc/seasons/and-live-soshite-ikiru
I had thought about different type of mystery. But episode 8 makes my every prediction invalid. After re watching the beginning of episode 1 I am more confused.