A good lakorn rely heavily on its character, script, and pranang ... this one happens to fit all requirements. Having Mark/Yaya are bonus to the fans because they're able to delivery due to P'Da's vision/demand .. have it be another couple, I'm not sure. In fact, I didn't even like them as much in Tawan Duerd (I sense sibling love there lol).
As for Nadech and Yaya, they have great chemistry in their first lakorn (DJA) and still have continuously, however, I have to admit that the lack of character and script sort of tone down their sizzling screen time. Same goes for all other koojin who repeatedly work together -- for example, I didn't like James/Bella until Padiwarada and Mark and Kim until TRRR (could be subjective as well).
As for Yaya's solo work, unfortunately, due to lack of character and chemistry, they weren't as great as I expected; even with my favorite actors, Umm and Rome. I think really in the end of the day, it's up to the director and producer to bring the best out of their actress. She will be great if she gets to work with good director and good produer; we can't have just good director and not good producer. A good lakorn required these two leader roles to be top notch.
Anyway, I love her as Jeed and Jee .. they're very similar in a way