From what I see from the comments, the story in this remake of the original Korean series is the same. This means that twists and revelations will not come as a surprise to those who have watched the Korean series. I have watched several Thai remakes of Korean series, and they are all competently made. However, I also wonder if it would be more interesting if they remake the series with a twist or with some surprising differences.

Having said that, I think the Thai version of Oh My Ghost is interesting enough. We can sympathize with the characters of Jiew and Khaopun, but their plights are not portrayed in a way that is too exaggerated. Artit (Chef), on the other hand, could have been developed further as a character. He can be rather childish and wants to get even with some ex-classmates for bullying him, yet he is also kindhearted to the one who has bullied him most badly. However, the nuances of the character are not fully explored.

Prin, the policeman who turns out to be someone possessed by an evil spirit, is another interesting character who is not fully explored. At what point in his life does he start getting possessed? Is he fully unaware and innocent? I'm baffled because the evil spirit appears after Prin is beaten up by his adoptive father as a boy--for trying to kill the adoptive father's biological son. If he is not possessed by the spirit when he almost kills someone, is he really the nice and innocent person he is supposed to be?

The presence of ghosts in the story make it interesting, but it is not clear why some ghosts (like Khaopun) look no different from human beings while others look monstrous and grey. It also doesn't really make sense that Jiew would become unafraid of ghosts (including the scary ones) after making friends with Khaopun, a ghost that really looks no different from human beings.

Of course, the story isn't really big on the typology of ghosts, and minor lapses in logic do not really affect the viewing experience. The disadvantage of producing remakes is also that there is pressure not to just match up to the original but also to be better or more interesting in some ways. I doubt this series has exceeded the original in any way although I have not watched the original.