[At first, he winces in response to the first part of what Kaiba says, because he is, as much as Jun hates to admit it, correct on that part. It was a mistake to agree to play this particular game, and a part of him had perhaps been naive enough to think that it would have likely ended merely at a momentary bout of humiliation and not... that, had he lost to someone other than Kaiba here. Now that it's been quite bluntly stated, he considers that perhaps he should actually thank Kaiba for literally saving his ass on that one.

But then Kaiba keeps going with the lecture, however, and any thought of admitting the mistake or even apologizing for it proceeds to go flying straight out the metaphorical window.]

You son of a bitch... you don't know anything about me.

[A nerve has clearly been touched as, whether or not Jun has realized it, he has ended up standing now, no longer able to sit still as his hands clench into fists on the table.]

If it wasn't for me, you wouldn't even have a school anymore. It would have been bought out by the Manjoume Group, and I can assure you, my brothers would have destroyed it, and your reputation with every Kaibacorp sponsor attached to you, if that had happened. If I had known that this was the thanks I'm going to get for choosing your school over my own family, then maybe I should have just let them do whatever they damn well please with it instead.

[He's momentarily forgotten that the Seto Kaiba that's here in front of him doesn't... know about any of that in his rage here, but it'll come back to him in a minute.]