Gong-gil brings out the weird in people, poor thing, he really does--everyone reacts strongly to how they perceive him (the king was the worst, OMFG. Because he was batshit insane. *shudder*)
He really does.
I thing Jang-saeng came a lot closer than anybody else. The king=BATSHIT, but Jang Nok-su saw him as someone who was power hungry and slept his way to the top-to her spot-- and Six, Seven, and Eight didn't really see. Really, the main thing was that he didn't see that Gong-gil was willing to put up with what the troupe master did, even if he didn't really like it.