Director Ren's grandmother suffered from depression during the Cultural Revolution as her husband was jailed and tortured. Although the Cultural Revolution ended almost half a century ago, the trauma left behind still affects three generations of this family.

九旬祖母因祖父文革被鬥，致使抑鬱纏身，甚至意外失去左手。《少年》導演任俠的家庭電影，赴廣東惠州拍攝多年未見的祖母與父親，既回溯斷手緣由，亦追尋半世紀前的動盪，如何或隱或顯地影響彼此。痛史從未遠去，伴隨往事的撥雲見日，屋內三代人的關係也漸漸改變。