Sawan Biang is about a young innocent woman named Narin who finds herself a victim of the lecherous stepson of her sister.Narin's sister Le ela lost her fiancee and was visited by a rich businessman named Kid Worawat, who was a widower and a single dad to his son Kawee. Kawee was spoiled and a ladies' man who happened to be Leela's high school crush. Realizing the loss of loved ones, Leela and Kid formed a bond and decided to marry. This caused a shock to her mother and Narin. After their marriage Leela and her family moved to Kid's mansion. Kawee hated Leela for replacing his late mother, so he used Narin as a tool for revenge, going as far as kidnapping and raping her.