That girl in When A Man Loves was pretty horrible to the guy almost from start to finish, and even in situations where he absolutely didn't deserve such treatment. It wasn't just how she acted/behaved toward him, but the things she actually did, the torment she inflicted on him. She was very selfish and conceited and I couldn't find anything redeeming about her. I think that, coupled with the fact that the actress was very unconvincing in the role ... pissed people off.
Anyway, I think Loving, Never Forgetting might fit what you're looking for. I can't remember if she ever worked for him, but she has a kid for him that she never told him about. Of course, he's this big shot CEO and she's this lowly office worker struggling to get by as a single mom. They reunite, he helps her out and they fall in love. Their romance was pretty nice & I love the chemistry & dynamic between them. Perhaps you'll like it, esp if you're a fan of Jerry Yan.