The record of Shang Qu and Liang Zhan once "divorcing their wives" show that not only in Han Dynasty but also in Pre-Qin period existed the phenomenon of "divorcing a wife because of no son".

《家语》中对梁鳣和商瞿“出妻”的记载表明，不仅两汉时期存在大量“无子出妻”的情形，在先秦时期也不鲜见。

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Later in the series, audiences can catch rare screenings of Zhan Liang's five-hour version of "Petition" and the 556-minute "West of the Tracks" (shown in two programs), Wang Bing's immersive portrait of the collapse of Shenyang, an industrial city in the northeast devastated by economic erosion.

WSJ: Repertory Film: Mining Forgotten Gems, Finding the Real China