Mrs. Kim is a character that doesn't know how to compromise.. everything has to be her way or never be at all. It's well known that a character like that is going to lose by that attitude more than gaining and that came so clear when Lane moved out. Mrs. Kim was broken but didn't show it in a clear way. She is that kind of person who doesn't show her true feelings, could it be because that will make her seem weak?! She is a very scary woman and I think she wants people to see her that way because that will make her feel strong and so she can carry on in raising Lane alone as a single mom ( or so I assume).. She is so grumpy and controlling and that's never good..
Fair to say that with all her bad attitude, we can't imagine the show without her!