M.R. Nareerat Warorot learns that she's been promised to Mom Chao Athitat Narangkul, the son of her father's friend. At first, she's virulently against it. However, when she begins to suspect him of being behind the opium trade group she's investigating, she agrees to the marriage in order to further her investigation. When the case is closed, she'll end the relationship. Unfortunately, she has slowly begun to develop romantic feelings for him.