We won't become a great martial artist with that attitude, so might as well not try. Yes, he'll be a tough master and, yes, he's probably not the nicest guy around. Our enemies won't care for our wellbeing, that's for sure.
There's also the fact that he knows what to do with our chaotic qi, that he's also a high-strength fighter just like Jing, that he actually wants to teach us even if it puts us through the wringer and that, when shit hits the fan and it's time to go against the Yemei nuns and the assassins that came afrer Shun, we'll be thankful for every last second of the training he gave us. When one of the five greatest Martial Artists wants to teach us, it's stupid to refuse.
Yao is a bro and he does care, but medicine and healing just isn't our department, at the end of the day we're a fighter and that's that.
Edit:
I can't help but feel that picking II might be a red herring, even if it's the most relevant to our current circumstances. That's the most important information here, but if one of the attendees here knew the criteria, which is doubtful, they certainly wouldn't share it so frivolously. Nevertheless, maybe we might gather a few scraps of info that we can infer something from? As for the other option, learning more about the Southern Maniac and his relationship with Luoying Manor seems important now that his gaze is upon us. This guy certainly seems to respect Lady Ji a lot.
Speaking of Lady Ji, I'm getting the impression that only she knows the criteria for admittance. I've already got my speculations about her, but I believe that the best bet for learning about how to get into Luoying Manor isn't in asking about the trial itself - it's in asking about Lady Ji. If you know everything about her, you know everything about the trial. You bros are really neglecting this one, and we ought to give it a look over.
So I IV. A Nice synergy here is that we might learn how Lady Ji and the Southern Maniac crossed paths with one another.
Good point, flopped.