I think this is how the drama is going to take place
The FL will die becuse of the poison and the ML will retrive here. But the catch is she'll loose her memories and fall in love with him. By the half or after 2 or 3 ep she'll regain her memories and the real plot starts from there ownwards (the love hatered relationship)
As an eldest daughter in the household i can somehow underatand Mi-rae's frustration. Even though my family is happy, if my dad gives my mom a hard time and leaves us to ourselves and comes back after years just becuse just has more money and wants to recline, I don't think that hatered for my dad leave completely even if i fogive him π€§.
I'm pretty sure the FL is gonna turn out to be his first love. And that ML was mistaken about it (we need to know the backstory first). If not, I can't wait to know how It'll turn out to be.
ALL THE MEN IN THE DRAMA ARE SPINELESS π