李承龙（车太贤 Tae-hyun Cha 饰）因为童年一场意外让他的智商只停留在了儿童时期，无论快乐还是悲伤都有着傻瓜一样的笑容
父母离世后靠着三明治店的收入来养活照顾妹妹智仁（崔雪莉 Sulli 饰），每晚唱着《小星星》想着妈妈，盼望着童年暗恋的对象芝浩（河智苑 Ji-won Ha 饰）归来 某天承龙在路上一眼认出了留学十年刚刚回国的芝浩 随着两人相处日子的增多，芝浩对承龙儿时的记忆被渐渐被唤起，在承龙的鼓励下对钢琴的信心也渐渐恢复 就在芝浩，妹妹智仁和玩伴相洙（李己雨 Ki-woo Lee 饰）这三个承龙最爱的人都陪伴在自己身边的时候，妹妹的意外病倒让幸福的故事开始发生了转折…
该片改编自韩国著名网络漫画家姜道英的同名漫画《傻瓜》
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