[ It's the only honest reply he can muster up right now. He doesn't feel like making the effort to hide his unhappiness when he's around Zero. Around other people, it's much easier to brush them off. He can't really brush it off when it comes to Zero, so he simply just answers as it is.
There's really nothing special here that he finds particularly interesting other than the feeling of wanting to say whatever is on his mind more than usual but he's holding his tongue while things are still mellow. ]
I'm quite aware. Nothing really interests me here other than the difference in the scenarios and the various other unfamiliar things that aren't in the other dome.