I found myself liking this drama a lot more than I thought I would.
The story was fresh and new, I liked the actors and the overall pace. Would I re-watch it again? maybe some parts I really enjoyed but probably not the whole thing.
The scheduler and rules of this drama were very well crafted and you could see how they affected not only the defunct lady but family/friends around her.
Time flies, and the message (I believe) is to not overthink things too much and live life to the fullest while you still can, because regret can be a horrible feeling.