A Promising journalist Yue went on a journey to find her biological mother with her childhood friend. A train ticket is their only clue, which finally leads them to a rural town.

Born an orphan and raised in a nunnery, she first thought that her parents abandoned her because of population inflation in China. Nonetheless, under the traditional concept in China, abandonment, especially to baby girl, is inured to the unusual.

However, the further discovery of 22 sets of roundtrip tickets reveals the real reason behide her abandonment.