I don't get why there is so much trash talking this show. It's not meant to be taken seriously. It's absolutely ridiculous but also so cute and funny. And saying there is no plot?? Were you people sleeping through this? Who cares if they were all speaking three different languages with each other, it just made it more absurd. And the guy with the dog ears and tail, wtf!! This was the perfect break from reality I needed in my life. An 8/10 for me.
If you're looking for the happy ending, I would download the episodes here. This person was also nice enough to add in the deleted scenes including English subtitles.
https://fayn3ko.tumblr.com/post/711355044266737664/killer-and-healer-eng-subs-all-episodes-uncut