I'm not sure cause in the preview for next episode seems like he's with Pa'Nun and the aunt. And the end of episode 16, after he reads the letter he thought maybe Pa'Nun might be someone whom knows something, so he'll go ask her. I'm not 100% sure I could be wrong and he does find out at his wedding.
Napat and Saiparn won't happen, cause for Napat it will always be Nida in his mind and heart. I think having these moments between Napat and Saiparn, is good enough for me right now, cause I know Saiparn and Poodit will end up together.
I'm going insane cause of the previews I just want the next episode already.... why did they add them on a Friday episode.