Sakao Duen or Kratai returns to Thailand with her father Wisut. She was born and raised in France. Luang Ratchamaitree finds out that Wisut hid the birth of Kratai a child born out of wedlock, and orders him to return and leave Kratai at the Ratchamaitree home. She doesn't want to stay and attempts to runaway. Luang decides to move her to Siracha, and appoints her aunt Penlak as her guardian.

Songklot is a future doctor. He was called home by his mother in hopes that he will marry the woman she chooses for him. Songklot is unable to tolerate this, so he runs away to Songkrit's, his older brother.

He meets Kratai, the mischievous girl 15 years younger than him who lives around there. He falls in love with her aunt Penlak at first sight. He offers to be Kratai's tutor so he can court her aunt. Meanwhile, Songklot and Kratai develop a close friendship.