I Will Disappear, Grand Duke

Second story in a row where i'm fine with everything except the ending.
I really dislike the ML, his attitude is sickening until the end to me.
As for the FL...such a bad taste, really, i can't even understand her, is she a doormat?
PS: What about Melissa?i feel it was such an unfair thing to just let her go to deceive the FL, and not even bring her back when things were solved until the specials...seriously.