First let me say that I love that this drama shined a light on so many types of mental health issues. The autistic brother was my favorite character and I loved his story line. In fact, I really enjoyed all the story lines in the show. The acting was top notch and the entire drama was visually striking.

My main issue was the Female lead character. Let me try to explain...
If you knew of a person who had stolen the money from a bunch of elderly people leaving them destitute with their lives in shambles and that same person later decided not to do that anymore...at least not as much, and even built a Senior center, but never made amends to the elderly they had hurt and in fact didn't even think they had done anything wrong to those elderly, you would find it hard to see that person in a positive light.

That is how the the Female lead character felt to me. In the first part of the drama we see her cruelty to animals, her self centered attitude and lack of empathy. She does two attempted murders and two kidnappings in the first few episodes. Plus the emotional blackmail that she often uses is just horrible. Her temper flairs and she gets violent any time she is contradicted. And this part of her personality never changes. Though we see her soften toward the ML, his brother, and a few others, she easily and quickly reverts to her previous ways as soon as she is challenged. Even when she had the opportunity to make amends for destroying her publisher, she makes him choose whether he will repair his business or not when it wasn't necessary for him to do so. Effectively making him choose to stay destroyed and have to rebuild everything when SHE is the one who caused the destruction. I found her character exceedingly uncomfortable to watch and was always wary that the male lead would get hurt or that she would just turn on him at any given moment.

There is a scene where she talks to her mother and says something to the effect of how she "almost" became like her Mom. I was literally thinking...no...you are exactly like your Mom except you have yet to succeed in killing anyone (not for lack of trying) and though you are unempathetic at times, you are not necessarily evil in your intentions.

I like the two brothers and her together, but at the same time I found it uncomfortable to cheer for because of her character. It felt wrong to want the brothers to get entangled with such a person.

Without her character, the story would not have been the same, but because of that character, I had to rate the drama lower. She was just too uncomfortable to cheer for. If the character has shown remorse (beyond saying sorry for stabbing the ML...twice), or really even seemed to change, I would have felt differently but not as it was.