Siwon in the dream thought he was talking to Jinha, Xuan can take the form of Jinha like he took Siwon’s form in Jinha’s dream. So Siwon just admitted that no matter what he will care for Jinha but I don’t believe Xuan was mad because Siwon loves Jinha but because he doesn’t understand how Siwon could still love and care for someone with that much passion. He doesn’t understand the concept of love because he has only been around evil and corruption so he is furious as to how Siwon would still hypothetically love Jinha even if Jinha betrayed Siwon. My personal thought on Xuan in this chapter is that he was reminiscing about how people in his past tried so hard to please him and they empowered him by worshipping him so he played them because he saw them as inferior. Jinha became a game for him but meeting Siwon is slowly changing his life and views on others. Siwon is so pure and kind that it puzzles Xuan and I don’t think he’s falling in love with Siwon but beginning to feel emotions that were suppressed while he was busy being a jerk. Like a heart he didn’t know he had is starting to beat and this revelation is scary for him so he’s blaming Siwon for making him feel this way which is why he punishes him and says he can’t forgive him. He says “how dare you” I believe because he doesn’t want to believe Siwon can be that kind and sympathetic and that it’s opening a door for him that is unfamiliar so he does what is familiar which is being his usual douchy self. He feels like Siwon is uncovering an unknown side of him that he doesn’t want to be revealed so that’s why I think he’s mad and that he acted out like that.
Hmm, so if he doesn't understand how Siwon could forgive Jinha even if he betrays him, then he shouldn't expect Jinha to be with him after all he had done. Or maybe by your logic, he understood that Jinha doesn't care for him as much as Siwon cares for Jinha.
What was that guy so angry about? Why did he get so furious when siwon said "because it is you"? At first, I thought he got so mad and jealous because siwon thought he was kang jinha when he said that, but he was like "how dare you!" so I'm confused.