Story aint very original, BUT its well played.
STORY:
woman gets to know she got terminal disease. She gets drunk and make wish to falling star for DOOMSDAY, ragnarok etc.
DOOM alas something alas GOD of DEATH hears her wish and want to fullfill it.

Its how these two meet. Next goes romance between them.

Now why I give it such high score?

Simply cause chemistry between main actors made me empathize with them. Root for them.
It made me sad and happy. Actors trully managed get me hooked to this drama and move mine emotions.

overall I rate it 9.5 though as I read others rewievs many wont agree BUT many cant handle emotional roller coaster.