For starters, I am very picky with my dramas and I'm hardly able to sit through most of them if they don't have my fancy. However I do checkout a lot of new dramas and when I read the story and cast for Catch the Ghost, I immediately knew I would binge watch the whole show in a few days. And that is exactly what happened lmao. I waited for the show to be completely aired so that i could watch it in one go but couldn't help myself so I started watching it when only 2 eps were left to be aired in Korea. Somehow I still ended up having to wait for the last two eps as I watched the 14 eps in 2 days. The wait killed me...
Now for my review-
So the things I absolutely love about this drama:

Acting: Kim Seon Ho and Moon Geun Young!
I was so happy with both of their performances. Kim Seon Ho is such a good actor and he had my fancy ever since I saw his mini drama called You drive me crazy (another amazing drama) and he did complete justice to his character of a man who always tries to stay out of trouble, but finds his sense of duty after meeting Yoo Ryung.
Do I even need to say anything about one of Koreas most prestigious and critically acclaimed actress's, Moon Geun Young. She plays both Yoo Ryung and Yoo Jin really well and sometimes you'd feel like theyre actually being played by different actresses because of her versatility in both roles. The chemistry between KSH and MGY both in reel and real life is out of the charts for me, I had a LOT of butterflies, however dont expect a lot of skinship because there ISN'T a lot. (Side note: watch their interviews and the BTS of the drama, they're really cute uwu) The other subway officers are hilarious too. The "villains" acted well too and had us fooled for a good amount of time.

Story: For me the writing did get a little shabby at times and was sometimes stretched, but i find that to be the case for most investigative dramas. Catch the ghost is a breath of fresh air in terms of crime and investigative dramas as humour is also a huge part of it. Even if you're not impressed by the story, you'll forgive it as the humour makes up for it and doesn't leave you bored at any point. There are a lot of twists and turns so it's never monotonous at any point. The drama is very gripping towards the beginning and the end, although the few eps in the middle feel a little dragged

Music: The ost's are pretty good although none of them leave a huge impact on you. In saying this I dont mean theyre not good songs, I have a few of them in my music playlists too, for a matter of fact. The bgm isnt over the top which is also good.

Rewatch value: I would watch it again but maybe not for the story as the cats already out of the bag and I know the killer, but for the acting, humour and the chemistry between the leads.

Things I didnt like too much: The side characters like Ma Ri, Woo Hyuk and Won Chul (the PR rep of police) never caught my interest and were really good at making me annoyed. I didn't care for Ma Ri and her side story and was not able to sympathise with her. Sometimes, the characters did really stupid things and had the suspects escape multiple times becuase of their foolishness, which was very annoying. The metro team in general was so incompetent and it seemed like they were only able to crack the case because of Yoo Ryung. In the 2 years they solved the subway ghost case, they didnt have ANY strong leads and quite frankly did absolutely nothing towards the case, while the subway team solved it in just a week...

But overall I will recommend it to anyone looking for something entertaining with good acting and a new story. 9.5/10