Wiman Sai

Phanin Niraphai, a young engineer and heir to a famous real estate empire, travels to Rayong for a site inspection. On his way back, he catches two thieves breaking into his car. He chases them to the beach, where a scuffle ensues, accidentally destroying a sandcastle built as a reference model by Alisara Chunhakorn, a beautiful artist. Though Alisara is upset, she steps in to help Phanin when he is outnumbered and beaten unconscious.
When Phanin wakes up, a misunderstanding leads Alisara to believe he is just a construction foreman. Phanin, charmed by her kindness and strong spirit, doesn't correct her. Back in Bangkok, he saves her again from thugs at a bus stop. In her haste, Alisara leaves her phone with him, leading to a planned reunion the next day.
However, fate takes a cruel turn. Phanin discovers that Alisara is the woman his beloved younger brother, Phinyo Niraphai, is deeply in love with. Simultaneously, Alisara is furious to learn that Phanin isn't a foreman but the son of Phuchong Niraphai, a real estate tycoon, and the older brother of her close friend, Phinyo. Heartbroken, Phanin tries to distance himself for his brother's sake.
When Phinyo proposes, Alisara rejects him, viewing him only as a friend. Phinyo falls into a spiral of depression and alcohol, causing Phuchong to despise Alisara. Phanin offers to talk to her on his brother's behalf, but arrives to find her with Non, a freelance photographer. Misinterpreting their friendship as a romance, a jealous Phanin insults Alisara’s character. A heated argument leads to an unintended night together.
Filled with guilt, Phanin offers to take responsibility, but Alisara rejects him and cuts him out of her life, moving to Suphan Buri to work as a teacher with her friend, Linjong. Two months later, Alisara discovers she is pregnant. Linjong, assuming Phinyo is the father, confronts him. Despite knowing the child isn't his, Phinyo offers to marry Alisara and care for them both. Alisara agrees, on the condition that she never has to live in the Niraphai household. This decision enrages Phuchong, who disowns Phinyo, while Phanin sinks into his own sorrow.