I agree with you. If they're going to pursue the romantic love point, they need to make it more harmonious with what they established. A stronger leg to stand on in the story. Honestly, the quickest way to do that would be to increase the number of those like MC (therefore have more studies on them) and have them become rare in the recent era or something.
More info on things as a whole is required, really. I kinda wonder if perhaps there's more in the original script, given that I believe it was translated from Russian. This isn't a slight on the translator, translation is extremely difficult, but there's probably been a loss.