I stumbled upon the ost by accident and had to comment here. Bow has such a sultry, mature, alluring and hauntingly beautiful singing voice, which is so unexpected since she has such a baby face. All biasness aside, Mike and Bow are honestly the only younger generation actors I've heard from all three channels who legit sound like professional singers. I heard their duet for their previous lakorn, but wasn't extremely impressed until now. Their voices were made for period osts. They have that classic tone (reminds me of Tae Pang Korn 2005's ost).
I still think Now was the perfect choice for this. Either with Porshe, Mike or New. Noon as Norah was classy, feminine, beautiful and graceful. Now embodies all of those qualities and more importantly, she can dance. Bow gives Norah a youthful, naive and innocent aura, which I guess isn't necessarily bad since it makes this version its own.