Based on the bestselling series of short stories by renowned Chinese writer Zhang Jiajia, I Belonged To You is a touching romantic tale revolving around two radio disc jockeys and the world they inhabit. They find the audience they reach reflects their own love and heartbreak, and forces them to deal with issues larger than just their own lives.

The quiet life of a mother and her young son living on a farm in Hokkaido is changed by the arrival of a man who ignites flames of romance in the heart of the mother and shows her boy the importance of grit and kindness, but then he leaves with the autumn wind.