Until the third act, when it suddenly becomes clear the film never really had anywhere to go (at least not in this installment), Dr. Cheon is mostly delightful. Even the listless ending isn’t not entertaining, it’s just listless.

After a magic-heavy dream sequence opening, Cheon settles into the gag–Gang Dong-won is a “doctor” who solves hauntings for his YouTube channel. Lee Dong-hwi plays his faithful sidekick, who does all the editing, takes the pay, doesn’t ask too many questions. Not even about Gang’s actual scheme: he’s a trained psychiatrist who knows he can’t cure people’s cultural beliefs in ghosts but can address the symptoms.

Or something. Lee doesn’t care as long as the checks clear.

It will turn out Gang’s actually using the actual mental health help racket to track down the very real, very evil shaman who killed his little brother and grandfather. Huh Joon-ho plays the evil shaman, who can possess people with ease, which makes for numerous good chase sequences and fight scenes. Dr. Cheon’s least realistic element might be Gang’s adeptness as a combination street and sword fighter. While the film hints at his quest to identify Huh (whose existence is something of a theory between Gang and his mentor, Kim Jong-soo), there’s no indication Gang’s been training.

Maybe it just comes with the magic.

The setup involves Gang and Lee taking damsel-in-distress Esom’s case and heading to a remote village. Esom can see dead people all around her and so on, including the evil spirit inhabiting her little sister, Park So-yi. Esom’s ostensibly going to be Lee’s love interest (Gang’s got no time for love), but no one told Esom. And then the movie itself forgets about it towards the end. Dr. Cheon only runs ninety-eight minutes, and they’re clawing for that runtime; there’s lots of delay. Good thing the cast’s so fun.

Well, Gang, Lee, and Kim. And Park to some degree. Since Esom’s in the place of Gang’s love interest but isn’t, she’s missing traditional functions. For a while, it seems like she might have more significance than a plot delivery device.

She does not.

Huh’s a threatening villain, but still cartoonish.

For most of the film, director Kim keeps a fine pace going, balancing the comic and action sequences. The story’s small but big, with the second act dipping into the flashback well a little at a time until the whole story finally comes out. But the geography–Esom and Park’s haunted village and its immediate surroundings (well, drivable immediate surroundings)–is rather finite. And since the movie spends the first half pretending Gang shouldn’t have a plan for this eventuality (one of his “fake” exorcisms leading to the real magic bad guy), it starts feeling cramped.

So instead of focusing on Gang, Dr. Cheon leans heavily on everyone else. Esom’s got damsel stuff, Lee and Kim have sidekick stuff, Huh’s got evil stuff. Gang’s around a lot and gets to charm a lot, but he doesn’t have a character arc. Not even the foreboding revenge arc; Kim warns Gang not to act with vengeance in his heart and whatnot, but it doesn’t even matter. Especially not once the film goes all out with the CGI in the third act. There’s a lot of smart, action-oriented magic on display in the set pieces in the first and second acts, but the third act decides it’s time to unlock the secrets of the universe onscreen.

It’s way too much for such little emotional stakes, derailing the film. And there’s not time to get it back on track. Dr. Cheon goes out with a bang, which is not what it needs.

Hopefully, they’ll figure out something for Gang to do in the next one.

Even if they don’t, get enough of the cast back, and it won’t matter.

Dr. Cheon’s a fun ride, but it’s (too?) determined just to be the beginning.