lol she should have already known all that, except for the father’s death and they’ve already been against letting him come close.
Istg if the author makes this another reason for drama, it’s going to become a plot hole.
Choi already told her she wanted to break them up, revealed his earlier victim, his forging of documents, etc.
That email was redundant and not credible, especially when Choi herself had already told what actually happened.