100% agree.
As someone who has chronic pain, I think the brother is so well written in the way that he portrays losing a normal life to chronic illnesses. That is such a hard thing to deal with already and then to see his brother succeeding in life from writing books about his struggles whilst he's bedbound actually going through these things, its bound to hurt and its obvious why he would lash out about that. And I know its easy to hate on the person who is hurting a main character but I really wish people had taken some time to actually think about what he was going through and the reasons behind his actions (especially as the author did such a good job of writing his character).

Why would you hate the sick brother? Just because he is treating his mother and Woo Jin bad because he is psychologically and mentally in pain? just think about it... you have this unstoppable pain and seizures and have to be taken care by your mother and brother for years even tho you are an adult! You have no personal life, you use a lot of pain killers and medications to stop the damn pain which in his case is not so useful...( which the medications have side effects to push your emotions and you can be very bipolar by it even tho you don’t want to ). Your self hatred gets the better of you and starts hurting others without realising. That what this poor kid’s situation is. He isn’t someone you should be hating just because he is so unhappy and in so much pain. I get that some of you hate on him because how he treats Woo jin and his mother badly but i mean just think about his situation too. I am not trying to protect anyone but seeing all of people’s hate comments about a sick kid even if he is fictional is annoying. Woo jin’s situation isn’t any better cause he has to take care of everything but there isn’t anything we can do... sometimes life is cruel to us. So hating on someone isn’t making anything better.