The acting of all the main cast was amazing. Do Kyungsoo and Jo Jungsuk are both have amazing acting skills and had a believable brotherly relationship. While the story was slightly cliche, it was cliche in a good way. When I decided to watch My Annoying Brother, I thought it was going to be a fun movie that would make me laugh. The movie did do that but it also made me cry. Overall an amazing movie that I would definitely rewatch after giving myself some time to recover. I especially loved watching the brotherly relationship between Do Kyungsoo and Jo Jungsuk's characters develop. I knew that Jo Jungsuk was very funny but I didn't know going into the movie that Do Kyungsoo would also make me laugh.