I'm not sure where you get that need to speak Korean business from. They've tried to give me those seats on numerous occasions and I always ask them for a different seat, being I typically don't like emergency row seats on the big planes. For the small A320/A321, I do sometimes like an emergency row, and when I request it I always get it unless already taken. And I don't typically speak Korean when checking in being their English is way better than my Korean. I've been flying OZ for years, so there's no issue with any policy change regarding this. But they may have some sort of policy about reserving them for their own elites, and then after that their frequent flyers of lower status, and not releasing them to non-Asiana Club members under most situations. I'm not saying they do have that policy, but I also wouldn't be surprised at all if they do. And being most Asiana Club members are Korean, perhaps it seems to you that only Korean speaking Koreans are seating in those rows. I have though seen non-Koreans in those rows who I seriously doubt are Asiana Club members. On my last transpac there was a non-Korean couple there and they made some comments while boarding that indicated it was their first time on an OZ plane. Though one of them had a leg injury, so perhaps they were seated there due to that.

As for the cabin being hot, I haven't really had that issue with OZ, other than on a couple occasions where there was some issue with the air conditioning, or the plane sat for some time out on the tarmac with the doors open and it was hot for a bit until the air conditioning cooled it off. And I'm quite sensitive to overly hot environments. Buses in Korea for example, especially the limousine buses to/from the airport can be stifling hot during the winter when they turn the heat up to maximum. And the buses can also be uncomfortably hot during the season just before/after summer when they don't typically run the air conditioning. KE seems to keep their cabin temperature higher on average than OZ. On the rare occasion where I've been hot on an OZ flight, I simply mention it to the FA and usually she'll request the cabin manager to turn the setting down a notch. Now the temperature can vary a lot depending on where you sit, and what kind of a plane it is. For planes without air vents, typically the seats next to the window are the hottest in my experience. The air ventilation usually blows down onto the aisle seats, and almost no air reaches the window seats. Not just on OZ aircraft, but on almost all airlines. I always request an aisle seat, and am almost always quite comfortable with respect to temperature. OZ doesn't have any A300's but on the airlines the do and when I've traveled on them, they are by far the most uncomfortable plane temperature-wise if you're departing and/or arriving from a hot climate. The air conditioning simply isn't up to the task when the plane is parked. Once up to cruising altitude, they're fine. For all of OZ's aircraft though, and I've been on all of them, there's no such issues as far as I'm concerned.

Most OZ aircraft do not have air vents, as is quite common in Asia. If you're from North America and used to having air vents, and need to have air blowing directly on you to keep you cool, then I guess I could see that you might be hot not just on OZ, but on just about any Asian airline. Some of the OZ planes do have air vents, but definitely not all of them.