Although I loved this show and was freaking out at the mere thought of getting to the end...when I finally got there I felt a little let down.  It left me with so many questions.

So if the sword was meant to kill Park Joong Won all of this time but Kim Shin didn't know he was a ghost so how was that possible?

I thought that after the sword was pulled out he would no longer be a goblin.  Was surprised to see that everything minus the sword was the same.  The basis was after the sword removal he would have turned to ashes so he can rest in peace.  Where he ended up looked nothing like peace to me.  

What was the point of allowing him to die if by using the contract he was allowed to come back to life with everything still in tact?

So she dies but gets reincarnated with memory of her old life?  I thought according to the other episodes, they don't usually remember their old lives.  If that was the case, why didn't the grim reaper and Sunny remember anything about their past lives?

Sunny dies after thirty years and looks exactly the same while everyone else aged?

I was hoping that when she had died, her mom would have been on the other side of the door waiting for her.  I thought that would have been nice to see.

So Eun Tak is on her second life and Kim Shin is still immortal which means that eventually after all fours of her lives, he will be alone again.  Where is the happy ending in that?

There was no need to bring back the aunt even if she was dead.  She served no purpose at this point.

I am probably overthinking way too much but I really did love this show and absolutely in love with Gong  Yoo...as you can see from my profile pic.   Now I am watching Train to Busan. YAY!!

@Wravyn

Just my point of view...

Being that he is immortal and the sword now removed...he would just continue to live his life the way he has been prior to meeting Eun Tak.  Only difference is he will be missing his love for eternity.  There is nothing happy about this at all in my mind.  He should have just died when she removed the sword.

I agree with you. It is like his punishment never really ended.   Although I never really understood why he was being punished to begin with.   I was a bit disappointed with the ending. 

I would have liked it that way: after he came back because of the contract he is human and lives his life with Eun Tak and then finally dies after a normal life span with her? :))

Well, first off, he sort of dies, then they spend ten years apart (of course, while technology is identical to the technology right now), she doesn't remember him, but he remembers her.  She finally remembers him, they get married.  They're married for about a week or so.  She's driving, and she sees a truck's brake malfunctioned and is heading toward a bus full of kids so she drives to intercept the truck and dies.  She refuses to take the potion of forgetfulness, promising that in her next life, she'll be with Goblin again.  Twenty more years pass, and she's reincarnated and promises to spend the rest of her lives with him.  The entire idea was that she would be able to kill him and set him free, but she's already freed him so he's going to keep living long after all of her reincarnations die.

It just shows the first of her next three lives, and still he doesn't have a way to die, so if she lives to be a hundred each life he will still be without her in the end, with several years between the incarnations.