高中生傑龍與唐蜜瞞著家人暗譜戀曲。一次出遊後唐蜜突然失蹤，傑龍只好將心思拉回課業，成功考入理想志願。當傑龍向光明未來邁進，竟見到消失已久的唐蜜與初生的孩子出現⋯⋯繼《小畢的故事》後，陳坤厚、 許淑真、朱天文和侯孝賢再次合作，改編朱天心短篇小說〈天涼好個秋〉，以冷靜留白卻不失韻味的長鏡頭，交織出一段莫可奈何的無果戀情。

Teenagers Jielong and Tangmi are secretly in love with each other, but Tangmi vanishes after they spend a night out together. Jielong refocuses on his studies and enters university. Unexpectedly, Tangmi resurfaces with a newborn baby. Directed by CHEN Kun-hou and adapted from CHU Tien-hsin's short fiction by HOU Hsiao-hsien and CHU Tien-wen, this is a notable work of Taiwan New Cinema.