Correct, the MC has known those 2 since they were very young and as far as I can tell they were love interests the whole time, which is why the betrayal is two-fold.
Not only did they try to kill MC but also went behind his back with MC's father.
Its the main reason why that reveal [about MC's father] is made, since if there was nothing between MC and those two then it wouldn't really matter.
edit: not that it matters to me that much by that point, since they've already tried to kill MC it means they're dead to me in that regard.
You're right, but that was... as the Americans like to say... the icing on the cake. Of course, what they did was something terrible... but the fact that they didn't betray the MC also in this perspective, may open the question that deep down, deep down, they had feelings for him and that, as they said here before, may have made them hesitate for a moment to murder him. Like they said, how can two trained girls with a years-long plan in place have such a hard time poisoning an arrogant boy?
So in my humble opinion, now they might have a bit of a chance of rescue. Before they were totally corroded, now you can still believe they might still have feelings for him. Or not,
Mad King it is god here, he who makes things happen, he tells us we are the "kings" but above kings are gods, so...
I like this game, is one of the first games of this style that I played, and that made me fall in love with these stories, then saddens me to see him having to go through "difficulties" for a "wrong" choice. Good that he came back and gave us more choices to go with this wonderful work. Yes, I was sad with the past update the way it came, but I'm happy now and ball forward.