I personally dropped it after reading up to the latest chapter available. There is simply too much angst for my liking. I genuinely don't understand why the two leads don't just escape and elope - yes people will be after them, but to be frank, there are not many who take either of them on in terms of skill. They both don't want the other to kill so they don't have more blood on their hands, and I personally think that the FMC should leave her brother and elope.
This was an interesting story, however, too much angst/misunderstanding for my tastes.