Play with fireSida is a young lady, who is pregnant. Her boyfriend, Thong, dumps her away. Ashamed, she kills herself. She always had issues with her authoritarian grandfather. Her older sister, Sakul, refuses to be dictated by her grandfather. Her husband died already. She has a young three years old boy. She meets Plai, who is a butterfly man. Women are toys for him (ของเล่น). Thong is also a former boyfriend of Sakul and still loves her. Plai is having an affair (เรื่องสนุกสนาน) with Thip, Thong's sister. Thip wants to marry but Plai is not willing. Plai has a high interest in Sakul as she is the first woman not falling to his charm. There are conflicts between Plai and Thong. Sakul needs to use Plai as a false boyfriend in order to stop being followed by Thong. She plays with fire (เล่นกับไฟ) as Plai has still a butterfly reputation. Plai comes to stay in Sakul's home. Thong (บัดซบ!) has raped Sakul before. Sakul's son is in fact his son. Plai's mother doesn't want to hear about Sakul. Twenty years ago it was still an issue for a widowed woman having a child to get a new husband in Thai society. Plai and Sakul announces their wedding to beat back Thong and Thip. The authoritarian grandfather and Thong prepare a nasty plan. Plai goes for a last night with Thip but gets beaten by ruffians commanded by the grandfather. He is almost blind. Sakul brings Plai to Pattaya in order to rest. Thong gets crazy as he doesn't know where Sakul and Plai are hiding. He hits and kills Toei, Sakul's friend, to know where they are. Going back home, Sakul and Plai face Thong. A fight erupts and Thong gets deadly shot.