Personally I think the ending is lackluster (It being Wohn and Seyeon in a confessional booth and Seyeon finally admitting her problems, and Wohn willing to hear her out. That just doesn't fit how the story had progressed I feel like. Yes it could be that it was aligning with the title of the comic, "Savior" Seyeon being saved by confessing her sins, but we don't know if she changed or not. We're not even told in the side stories or epilogue Q&A. The ending brought up more questions rather than answering them.)
The creators original ending had deaths, which i'd rather not prefer, but I would've liked an ending that wouldn't be somewhat opposite of what the creator had named the comic... No one in the story was "saved" or reached salvation (You could say that Wohn was saved from Seyeon's possessiveness, and Juyi was saved from her abusive family. Or that Seyeon confessing her sins allows her to reach salvation.) Even though at the beginning Wohn was saved albeit deceitfully by Juyi, that's probably the only point you could consider someone was regarded as a "Savior".
It's not a bad comic at all. I really liked it, and its concept. I just feel like it could've gone on for another 10-20 chapters. Like I thought when Juyi met Seyeon at the end that Juyi would become possessive like Seyeon was and would use Seyeon like Seyeon had been using Wohn, but it was just a chapter of Seyeon acknowledging Juyi's feelings and Juyi getting frustrated and realizing its futile then just walking away potentially never seeing Seyeon again. I understand though. Cause Seyeon was at her lowest and probably most manipulable state of mind, but she still could only think of Wohn (Finally realizing her feelings for Wohn, not just using Wohn as a method of self harm.) So of course you would give up on chasing a person like that.
Overall i think the comic is really good despite a few things, it answered mostly all the questions that the main story brought up (Except the ending that brought up some more), and it showcased Wohn's, Seyeon's and Juyi's thoughts, feelings, and state of minds in detail. To the point that the vampire who has killed people seems like the most innocent of the 3. The endings is not a happy one, but its not a sad one either. Yes we don't know if Wohn and Seyeon became friends again, or what happens to the 3 of them and if they're happy or not. But personally I don't think there was any way anyone in this "love triangle" would get a happy ending. It was too toxic for any chance of a proper loving relationship to form. And so, it ends up with the main characters having similar experiences. Wohn ends up alone, with her relying on strangers coming to the church to survive by drinking their blood, but Wohn seems content with living after Seyeon gave up her obsessiveness of Wohn, because she wanted Wohn to not die. Seyeon also ending up alone, exactly like her younger self. Seyeon ended up becoming her younger self once again, staying at the orphanage, depressed, self harming still, and eventually admits her sins. Juyi's life completely changed. She turned into a vampire after getting involved with Wohn and Seyeon. She manages to somewhat confess her feelings, which lead to nothing but frustration. Juyi ended up alone exactly like the other 2.