The concept is very interesting, and the cast & acting is top notch. However earlier on you'll be asking WHYYYYYY would you .... WHYYYYYY wouldn't you. I can't even with this absurd logic.

What I loved:
The entire cast from the leads the supporting cast
Jang Pan Seok (the fact that he's NOT playing a bad character for once) Literally every drama if he's in it he's the bad guy.
Lost souls in this village finding meaning of their new existence and new life -- family friends, love they never received during their living life etc. Heartwarming
The detective <-- why isn't he in more ML roles? His acting is fantastic

What I've hated: (don't read it if you don't want any possible spoilers)
Beginning of the story already with major illogical plot holes like why didn't ML report the girl being kidnapped? That would've been more logical to explain why HE was kidnapped in the process?
So many times, to tell ML about the girl (just the kidnapping part) and yet NOT?
Not so mysterious turn of events. 90% predictable.
Questionable ages . ML witness something 27 years ago and he looked 7ish ? 27 years later he supposed to be 30 but looking 40? Like really doesn't make much sense