Spoiler
here will be, and yes she is the fl the end of the novel the mc and her are engaged. It's a shitty ending too btw the romance part is so forced that I wanted to throw up a couple of times, and that's me saying it fucking sucks considering I read romance fantasy all the time (/TДT)/ AND YES by this time in the series she was actually planning to kill everyone for the blood of day thing and Mc had an actual chance to get rid of her but still saved her and said internally ' I don't know why I even saved her when I was actually thinking of getting rid of her' it's like the forced bullshit then suddenly thinks she looks kinda cute like wtf are you even saying like you know she wants to kill you all right?
Spoiler
This is the type of story that's super great in the intro then gets super shitty as hell as it gets closer to the ending, I wanted to bang my head on the wall by the end of the novel because it never really answered any questions about how they got in this situation and the ending was so useless as hell, for an example it's like there's 100 floors on a tower but it suddenly ended on floor 45 and you will never know what the rest is about because it ended there for you and there's no more continuation
I think that gun girl won't be the FL but instead be a character like han sooyoung from ORV, a killer who isn't entirely merciless but seems that way at the start but will grow to be a supporting companion for the MC.