Ban Sai Thong Pojaman Sawangwong

Potjaman Pinitnan (Min Pechaya) travels to live with her relatives at the Baan Say Thong estate following the final wishes of her late father, who wanted her to complete her education. Potjaman is a courageous and proud young woman, raised with strong self-respect by her beloved father. However, her arrival is far from welcoming. Her aunt, Mom Pannarai (Duangdao Jarujinda), is absent despite receiving a prior letter from Potjaman’s mother. Exhausted from the journey, Potjaman faints in front of M.R.W. Pharadee Sawangwat (Khouying Yai), who receives her coldly. Though appearing stern, Khunying Yai is secretly compassionate. Upon seeing the unsealed letter from Potjaman's father, she decides to let the girl stay until Mom Pannarai returns.
When Mom Pannarai returns with her younger daughter, M.R.W. Phawinee Jaratreuang (Khunying Lek), she is furious to find Potjaman in the house and disparages her parents. However, Khunying Yai realizes that Potjaman is indeed a blood relative of the Sawangwong family. Specifically, Potjaman is the daughter of Phana Pinitnan, the son of Surapol, who was the biological younger brother of Chao Khun Rajapipit, Mom Pannarai’s father. Potjaman’s mother had previously cared for Khunying Yai’s grandmother until her final days. Touched by this debt of gratitude, Khunying Yai takes Potjaman under her guardianship.

Life Under Pressure

Khunying Yai worries about Potjaman's tuition fees because she lacks a career of her own—a result of Mom Pannarai forbidding her from leaving the house years ago due to a past romance. However, Potjaman reveals her father saved some money for her studies, needing only food and shelter. Meanwhile, the luxury-obsessed Khunying Lek hates Potjaman, viewing her as a nuisance, and constantly bullies her.
Within the hostile household, Potjaman finds solace in M.R.W. Panuthat Sawasdee (Chai Noy), Mom Pannarai’s 14-year-old disabled son. Mom Pannarai despises Chai Noy for his physical deformities and left him to be raised by the kind nanny, Nom Thip. Potjaman pities Chai Noy as he reminds her of her own siblings, and she forms a deep bond with both him and Nom Thip.
Potjaman lives like a servant, balancing heavy housework with her studies. She eventually moves to the servants' quarters to study late at night without disturbing others. During this time, Mom Pannarai’s sister, Praewphan, moves in with her husband and children, adding more tension to the estate.

The Return of the Master

Potjaman eventually encounters the elderly and ill Chao Khun Rajapipit in the "Cross Building." When he hears her grandfather's name (Surapol), he becomes terrified and his condition worsens. One night, while exploring the mysterious building, Potjaman is startled by a ghost-like figure and faints, crashing into M.R.W. Pharadaphatrapee (Chai Klang), the master of the house who has just returned from abroad.
Chai Klang (Veerapap Supapbaiboon) begins to improve the lives of everyone at Baan Say Thong. He sends Chai Noy for medical treatment, allows Potjaman a proper room befitting a relative, and takes her under his personal guardianship. A deep bond begins to form between them.

Schemes and Trials

While Chai Klang is away on business, Khunying Lek plots to ruin Potjaman by introducing her to bad company. She pretends to be a mentor while secretly hoping Potjaman will be caught in a scandal with her friend Nakul. However, Tan Tom (Anek Nopparat), Khunying Lek's fiancé, sees through the malice and protects Potjaman, eventually realizing he loves Potjaman instead of Lek.
After a series of dangerous events—including a plot to lure Potjaman into a lewd film industry and a car accident—Potjaman returns to Baan Say Thong. In a dramatic confrontation, the dying Chao Khun Rajapipit confesses the truth: Baan Say Thong actually belongs to Surapol’s lineage, making Potjaman the rightful owner. Potjaman, however, refuses to claim the estate.

Marriage and New Conflicts

After many misunderstandings, including Tan Tom’s attempt to propose to her, Potjaman chooses Chai Klang. They marry in a grand ceremony organized by Khunying Yai. However, the drama continues when Potjaman’s younger sister, Potjanee, arrives. Jealous and bitter, Potjanee claims her right to live at Baan Say Thong and behaves arrogantly.
Mom Pannarai and a new maid, Saijai, continue to plant seeds of doubt, telling Potjaman that Chai Klang only married her for the estate. This causes a rift between the couple during their honeymoon and beyond. Potjaman longs to hear the word "love" from Chai Klang, who believes his actions speak louder than words.
Further complications arise:

• Khunying Lek marries a wealthy merchant, Noem, only to find he already has two wives who mistreat her.
• Potjanee tries to seduce Chai Klang and later accuses Potjaman of having an affair with a local music teacher (who was actually black-mailing Potjanee).
• Chai Noy tragically passes away, leaving the family in deep mourning. Mom Pannarai realizes her love for him too late.

Conclusion

After Chai Noy's death, a weary Potjaman returns to her mother's house. Khunying Lek and Potjanee finally discover the truth about Potjaman's integrity through a hidden letter, clearing her name of any infidelity. Chai Klang rushes to Potjaman, discovering she is pregnant. He finally confesses his deep love for her. The story concludes with the couple prepared to return to Baan Say Thong to face future obstacles together, united by love and the true legacy of the Sawanwong family.