This will adapt from Thai literature, title as Khun Chang Khun Paen. Wanthong is a fictional character in this story, be the main character in the first part, a beautiful woman who gets involved with two men and ends up with a tragedy.
Kaew and Chidchanok are twins who lived separate lives because of their aunt who wants to inherit their father's fortune. Kaew grew up in poverty with a cruel mother and sister, while Chidchanok lives with her father after they fled to France. Chidchanok decides to go back to Thailand to find her mother. Eventually the twins meet and try to help each other get away from their aunt, who wants to kill them.
It's about a love story between a man and a female ghost/vampire. Dao is under the control of a monster. It uses her beauty to take blood from men who came to stay around that area. Marut helps her break away from the monster and takes her home. They fall in love, but his mom already has a girl set up for him.