I feel like I'm the only one that likes the brother. he feels protective over his sister as most would. Note that i am speaking in terms of episodes 1-13. I get not liking Hou Chi and being wary of them together. After being separated from his sister for so long, he reunites with her only to realize she was locked up in a building. The people who locked her up are the same people that Hou Chi respected as his seniors and teachers. Shi Dong just wants to protect his sister of the people who had been capable and had reasons to harm her. He is reasonably against Hou Chi and the people in his sect after what they did to Shi Xia. All of this added to the fact that Hou Chi is claiming that his sister isn't Shi Dong's, but his, not letting Shi Xia and Shi Dong spend time together despite Shi Xia telling him that Shi Dong wouldn't harm her. It's also obvious that Hou Chi doesn't understand the real concept of siblings. Shi Dong just doesn't want Hou Chi to take advantage of Shi Xia under the guise that he is just being her brother.