《仙后座（Cassiopeia)》是一部有关“痴呆”的电影，讲述的是作为律师、母亲、女儿，想拥有完美人生而努力的秀珍（徐玄振 饰）患上痴呆症慢慢丧失记忆之后和父亲仁宇（安圣基 饰）之间的特别的相伴故事。

对家人感到失望的10岁女孩汉娜遇到父母长期在外工作的9岁的友美和7岁的友珍，三个小女孩互相依靠，重组小小的家，为了挽救彼此的家庭，她们决定开始一场未知的旅行。擅长描摹女孩细腻故事的韩国女导演允佳恩，继《我们的世界》之后的又一部佳作，用极富爱心的洞察力展现孩童之间复杂而微妙的情感，给成年人以别样的启示。

12 year-old Ha-na is worried about her parents fighting all the time, and Yoo-mi and Yoo-jin hate that they move all the time. One summer holiday they become friends and share a bond. The three of them talk about their families and decide to take a risk to protect their more than precious homes."I am going to prot…