I have watched several KDramas which cry out of an inconclusive or even sad ending, but spoiled by contrived happy, happy nonsense. It must be a law of some kind. Having said that, some characters are so engaging I yearn for their safety / return / miraculous escape.
Like too many of these shows, they'd be much better with tighter dialogue and fewer episodes.
'Blood', of course, asks us to suspend disbelief but they do a good job confusing the viewer with medical mumbo-jumbo.
The characters are not one-dimensional, indeed there is a fairly good attempt to understand the motives of the evil guys. The acting (as alway) is very good - in a soapy, melodramatic way. And as with almost all KDramas the production is absolutely first class.
But please... the ending??? Was a second series planned but never green-lit?