Nah Reynu is nothing like Lumyong, Noon's character. Lumyong was a gold-digger con that tricked men out of their money then later a drunk. Completely selfish, greedy, lazy and didn't love anyone but herself. No redeeming qualities. She didn't treat anyone well and used everyone. I say she's more similar to Chompoo in Dok Som See Thong and the other "gold-digger" characters. Noon did kick-ass though.
Reynu is a more honest character being a straight-up prostitute than gold diggers with a lot of husbands type characters. She's selfish too but she has genuine friendships with others. She's nasty to people who are nasty to her but she's loyal and protective of people she loves, like her younger sister, her prostitute friends, Asa and even Junta. I would say Noon played a more black character. Reynu is in the grey area. And Reynu doesn't really care about being rich, just enough to live on. She doesn't want all her husband's family money. She's willing to work hard and is quite happy making and selling pastries. I think Reynu is a pretty unique character.
And yes TNG was a huge hit but that was a long time ago when ratings were higher and not that many competing channels. I think if KK does something like Soot Kaen Saen Ruk, it will be a success.
But I saw somewhere that it's 30 episodes! That means draggy and a bunch of focus on everyone. No way they can maintain good ratings for all 30 episodes. Way too long. SKSR was only 18 episodes and they had just as many characters.