过去30年间被遗忘的都市，大家是刻意不想记得你的往事吧？
1977年韩国铁路里里站爆炸事件发生30年后，那里生活着一对兄妹。
30年前，在不起眼的小城市里里，发生了骇人听闻的爆炸事故，一辆装有40吨重火药的货车爆炸了，所有的村落都变得面目全非，谁都不想再回忆那段剧痛的过往。珍书（尹珍熙饰）是在爆炸发生所引起的微震而令妈妈早生的女孩，爸爸妈妈都在这次的事故中不幸身亡，留下她和哥哥腾古相依为命，依然在这个村落生活着。
彼此把对方当作动力的兄妹，艰难地维持着生活，哥哥的病越来越重，珍书以后的路该何去何从？
执导本片的张律，曾凭前作《芒种》在影展中获得法国独立电影发行协会奖。他认为尹珍熙是那种无法完全用语言形容，散发独特魅力的女星，现时她正在全罗北道益山市进行拍摄。

Former festival director Kim Dong-ho always mentioned that he wanted to make a film when he left his chair. After he stepped down from his festival director position that he was dedicated to for fifteen years, he started to make his first short Jury. In Ongoing Smile his long time friend Mohsen Makhmalbaf followed his trail as he goes down the road to his directorial debut. Often called endearing, there are three well-known things about Kim Dong-ho; the enormous amount of booze he can drink; his regular life routine and ongoing smile on his face. At five o’clock every morning, he gets up from the bed and starts a day with newspapers. He exercises, works, meets old friends, and makes a film. He started his career as a government official and had a busy life as he transformed from a festival director to a film director, but his life never really changes. Makhmalbaf, with friendly gaze, brings Mr. Kim’s past and present into his daily life and ongoing smiles. (CHO Young-jung)