she took out a huge loan from the bank so she could give money to her brother because he was getting married and needed to buy a house (her mom forced her). but you'll get to understand the husband's point of view as the story progresses, it goes way deeper.
I hate when they expect me to care about a piece of shit disgusting asshole just because he's the FL's "dad" or whatever. really wanted to give this a higher rating but I despise the whole father propaganda kdramas have going on.
what did the dad mean when he said dont let anyone find out at the end of ep2?
don't let anyone find out that she "caused" his death. he wanted her to leave so that no one would know that she was around at the time of his death. she lied and said ok even though she saw that people were coming and they would know that she was with him when he died and would blame her.