Personally I think it ended fine. Stories like this rarely have a happy ending
I didn't really expect a happy ending but this felt so rushed like we don't even know what happened to bum or the police officer. Did bum eventually go to jail? Did the officer run him over? Is he ALIVE? There are so many unanswered questions.
I mean I can see why itd be unsatisfying, but I think I'm used to open endings and forming my own conclusions. My theory is that Bum died, possibly because Bae ran him over, and therefore didn't go to jail, instead opting to chase after Sangwoo (who he's not over despite his claims) and ends up fulfilling the viewpoint of "being joined in death"
Again though its something I'm used to and enjoy, which is why I didn't find it rushed. I can see why it wouldn't be considered a decent ending though
I just wanna tell all the people who haven't seen it yet, that the epilouge/creator's note is available on lezhin for free and I read it and she answered some questions but she didn't specify whether or not bum died or if sangwoo is really dead. She may create a new comic but she's not sure. I'm pretty sure the comic is officially over though. Its really sad how such an amazing comic ended so terribly.