Tian, the son of a high profile officer, receives an emergency heart transplant surgery. When his donor's identity is concealed from him, he's driven to great lengths to discover her identity and manages to recover a notebook that might otherwise have been forgotten. Torfun was a volunteer teacher who died in a traffic collision. From her journal, Tian learns about her life in Phu Phan Dao, a village on the country's northern border. Something about her notebook inspires Tian to take up Torfun's position at the school himself.

Tian's first day as a teacher doesn't go well. After being embarrassed by Chief Phupha in front of his students, he's unable to keep the children's attention and is later snubbed by the villagers. When events continue to spiral out of his control, Tian begins to question his fitness to his post.

Feeling out of place and of little use, Tian devotes himself to cultivating a strong relationship with the Phu Phan Dao villagers. From them, he learns new skills and ways. While assisting them in their tea trade, Tian discovers the merchants they trade with are ripping them off. A confrontation ensues and things get violent. After all the progress he made, Tian feels he's somehow betrayed the villagers by instigating a fight and ruined their newfound friendship.

The village celebrates a wedding. Tian seizes an opportunity to get Phupha to escort him to the Pha Pun Dao cliff.

Tian joins Nam for a trip into the city where he meets up with his old friend, Tul. While in the city, Tian meets a powerful local, Mr. Sakda.

With the local merchants refusing to buy Pha Pun Dao tea leaves, Tian searches for a way to help the villagers avoid selling their tea to Mr. Sakda

After Tian's recovery, Phupha invites him to move in together for his protection from Sakda's thugs.

As the repairs to the school house are completed, Tian finds the courage to reveal his secret to the villagers of Pha Pun Dao.

Tian discovers that Phupha knows his father causing him to question their relationship. Phupha pushes Tian to return home after a New Year's party hosted by the village.

The day arrives for Tian to return to Bangkok. As he adjusts back to his old lifestyle, he still thinks of Phupha and the village leading him to question his desire to finish his engineering degree.