So for those who want to get a gist, here's what I know reading from ones who had watched the previous version:
Noon is E-sa who grew up poor believing she could get a better a life when any oppurtunity comes her way.
She has her two kids with Bee Teerapong who is the first husband and gives one son away to the main wife, Nok Sinjai since she only has daughters. Esa flees away with her own daughter, one of Nok Sinjais daughters (played by Paan Paan) and Pong. Esa lets them adopt her daughter instead (idk why). Pong likes Paan Paan but she refuse to sleep with him so he sleeps with Esa instead and then Paan Paan kills herself. Pong dies too somehow and the daughter grows up hating her biological mom, Esa, because she thinks she killed her adopted parents. Then stuff happens and Esa gets with many guys to support her daughter. The thing is, her daughter likes one of the guys that are in Bee Teerapongs house and they are blood related. Because of this the daughter finds out that they are mom and daughter. Also, the son starts liking his own mom but she knows it's her son. They all eventually find at the end.
I might have missed a lot of parts and may be wrong but like I said a summary from others who have seen the lakorn. Hehe hope that helps