Her dad Is a garbage.
He's still garbage, is the conclusion I came to: he should've told her the truth when she started working at his company (at least, to her alone). She deserved to find out in another way, no excuses not to tell her when she was already this grown up. He's a coward for acting behind her back like this. She wasn't guilty of anything.
She fell in love with her killer? Bruh, didn't you learn anything 19th time?