No, he shouldn't. There's obviously something mentally off with him. My assumption is that he has a brain injury, hence why the extreme anger. He's acting out in the only way he believes will help. He's not a terrible person, but there's obvious sign that he's not all there and is just as scared as Yeseung. He doesn't want to lose him, but neither of them are capable of expressing their true feelings properly
I feel like it's just that he doesn't have an understanding of abuse/fawning in even the smallest remotest sense. To him, he just sees Yeseung as being loyal and choosing his master/sugar daddy over him, he can't understand why, and it's driving him literally insane because of how obsessed he is. I wish there was more internal dialogue for his thought process so we aren't all left trying to guess off of only vague facial expressions.

I don’t think he should be THIS mad at Yeseung??? Like, sorry he had a trauma response while in the presence of his abuser… Damn…