The film, set in 1972 and 1987 , explores Singha and Mituna's love for each other; it opens in the present, before returning to their high-school days.

Singha (Mario Maurer) receives a call from Jack, a high-school friend who sets up a reunion for their class.

When they meet, they have a conversation which turns to Singha's last year of high school (when he met his first and only love, Mituna (Apinya Sakuljaroensuk).

Singha's group, Jack and Kanda ask Mituna's mother to allow her to be part of their project to help educate children.

Mituna's mother gives him her notes, in which she wrote that when she transferred to the school Singha became the most important person in her life.