limlift's manga / #romance(17)

everything was great until the ending tbh. it was badass how she shot him. but how is Isaac the killer? I remember the part where the killer killed a man that fell from a carriage. I forgot which chapter it was but Isaac was with Giselle the whole time having sex at that cabin they found. so how is he the killer?? like the killing happened at the same time as the two going to that cabin in the chapter. the ending felt rushed and I have a feeling that it could have ended in a better way.