Yard was poised from Ploy's medicine, but the old lady found the cured for it, she planted the antidote, which showed in esp 15 where the old lady and yard were in the garden and ploy came in.
When they first read the curse Ploy just disapear, it cannot kill Ploy. They have to read both curses, one from the father and the other guy (you'll know who I reffered to when you watch it). Anyway Ploy disapear and Yard and her mom united with her p'chai at the wan. Paul and Yard ingaged, but the poison make Yard very weak and they take her to the hospital. At the hospital Yard, Mong, and the doctor lady were catcher by Ploy's men. The old lady found out where ploy took them and tell Paul. Paul, the doctor and Paitoung go rescue them, but end up getting caught too. Ploy give Yard some medicine so she can live one more day. Ploy asked Paul to pay back his life to her because she used to save his life from the snake pioson, but Yard reveal the true that Yard was the one who saved Paul from suck the poison out. In the meanwhile the bad guy who has the other piece of the curse come resuce them. He was poison during the fighting so he died after they kill ploy. Well, he and Paituong read the curse and Ploy was killed. They had to read the curse because Ploy kill the professor and Paituong boss. Yard was going to die when the sun come out, but the old lady bring the medicine on time so she come back to live. Yard and Paul were standing at the "Prasat" and end there.
Sorry for the summary. HOpe this will help.