I can remember one scene. The FL has grown old and is babysitting her grand-kids, reading them a book with a story about a scary mythical being (possibly a gumiho or a grim reaper).  Their parents come in and ask why she's reading such a tale to them..she answers something like they were asleep anyway. Later she is seen walking outside not knowing she is dead. then the ML shows up to take her to the after life.  They were together earlier and met again in this way.  I hope someone remembers! I've re-watched so many dramas to find it! (It may be a thai drama instead of a kdrama)  THANK YOU!!!