Sawadee Khun Nai

Here’s a clear English translation of your story:
The story begins when Mom Chao Athit arranged an engagement more than ten years ago between his son, Mom Rajawongse Duangta, and Chitchamai, the daughter of Khunying Chomoi—despite the fact that the two had never met.
When Khunying Chomoi learns that Duangta is returning from England after finishing his studies, she comes to claim the engagement promise. Mom Chao Athit agrees to proceed with the arrangement once his son returns.
After arriving in Thailand, Duangta feels uneasy about marrying someone he has never met. Wanting to learn about Chitchamai’s character, he disguises himself as a songthaew (shared taxi) driver in her neighborhood.
During his visit to Chomoi’s house, he meets Jaew, a lively servant girl. By coincidence, Jaew is wearing Chitchamai’s clothes, leading Duangta to mistakenly believe she is Chomoi’s daughter—the woman he is supposed to marry. He is immediately taken with her beauty and personality and tries to get closer to her.
Jaew, amused by the situation, plays along and pretends to be Chomoi’s daughter, calling herself “Khunying Jaew.” Meanwhile, Duangta also hides his identity, introducing himself as a humble driver named “Pad Thai,” even speaking in a rustic accent.
As they spend time together, Duangta observes that Jaew is kind-hearted, down-to-earth, and unpretentious—she’s happy eating street food and never looks down on him. He grows deeply impressed by her character. Their “fake” relationship gradually turns into real love, though neither knows the truth about the other.
Complications arise when Toom Meng, the son of a local transport owner, becomes jealous of Jaew’s closeness with Pad Thai. After discovering Jaew’s secret—that she is actually just a servant—he blackmails her into spending time with him. This creates tension and jealousy.
Eventually, Pad Thai (Duangta) loses his job and becomes homeless. Jaew secretly shelters him in Chomoi’s house, with the help of other servants. Wanting to help him rebuild his life, she enters a singing competition, wins first prize, and gives him the money to start a Pad Thai food stall. Their bond grows even stronger.
At last, Duangta reveals his true identity—that he is the nobleman engaged to Chomoi’s daughter. Jaew is shocked and heartbroken, believing herself unworthy because she is only a servant. She refuses his love and leaves him without revealing her true background.
Devastated, Duangta returns to his palace but cannot forget her. When he later asks his father to formally propose to Jaew, the truth is revealed: Jaew is not Chomoi’s daughter but merely a servant. Despite this, Duangta insists on marrying her, valuing love over social status.
Chitchamai, furious at being deceived and rejected, tries to win Duangta back and hurt Jaew emotionally. Conflicted between duty and love, Duangta ultimately realizes that his heart belongs to Jaew.
Jaew disappears, and Duangta searches everywhere but cannot find her.
Months later, a woman named Khunying Ranjuan returns to Thailand after living abroad for over 20 years. She reveals that Jaew is actually her relative—and the true owner of the house. Khunying Chomoi had only been a trusted servant entrusted to manage the property but instead took over and treated Jaew as a servant.
Furious at this betrayal, Khunying Ranjuan exposes the truth.
What will happen next?