The answer to your actual question is, 'someone willing to sacrifice a little fairness for harmony,' which, okay, now that I say it out loud -

[He does laugh, now, ruefully.]

I think it's okay to want harmony at a party.

[He still needs to make sure Edwin will be okay with Arthur being at the Engagement party, and at least warn him about Yunlan, and make sure they're not sat next to each other -]

I'm glad I'll get to come, though. I'm - very grateful, that you reached out.

[He can tell how much courage it took, although he's not sure he should say so.]