Aww. I am curious to know what happened to na in during the ritual and why he didn't need any prep. Even his guards knew what was up but he didn't. Sounds sinister.. meanwhile gwen is hitting on him blatantly, it's only a matter of time amon gets to know. And the whole thing about the feather in hair, and it reminding amon of the person who played that music he remembers 500 years ago, that must be related to na-in's past. He doesn't remember a lot about his past and can't place a lot of things or how they happened which gels with the memory wiping ritual.
Oh but don't give spoilers. Hypothesising is fun.

It seems like na-in was or is a god as well, and he was captured, probably snatched from Gwen by amon. So amon, assisted by his head priest who does the shady jobs for him, holds memory cleansing rituals for na in. That's why na-in has rogue memories appearing in his dreams as well as waking state. And gwen, who also seems to be a god or at least superhuman, has come to get na-in back from Amon. The reason why he is so forward is because he knows he has the power to fight amon if need be.