It's a lot... quieter than I thought. But not in a bad way. It's dark without coming of as heavy and more than watching this story and its characters I feel like I'm analizing them.
I was thinking that too, but I am still curious about the ghost who possessed him at the beginning. But then what…
Tess can possess people because he's dead! We don't know why his ghost its still bound to the hospital (I mean he can go out, but he's always there), but he himself says that he can possess people without consequences because he's dead. About the ghost who possessed Young Min when he was an intern... I get the feeling that's Tess, but we know too little yet to make theories shsh
Tbh I thinks Seung Tak can just see ghost (like he seems to be some sort of psychic), but we see that Young Min is the only one who can possess him even if he's not death, so maybe it's really because Young Min operated on Seung Tak and saved his life when he was younger.
For everyone wondering whether to give this drama a chance or not, I suggest to watch until episode 4 (it's here that things start to get interesting) and by the end of it you'll know if you're hooked enough to keep watching or not.
1 
1 
About the ghost who possessed Young Min when he was an intern... I get the feeling that's Tess, but we know too little yet to make theories shsh