苏莹（王丽坤 饰）和程峰回（郑元畅 饰）是即将步入婚姻殿堂的恋人，欧美就在苏莹沉浸在幸福之中时，欧美一个神秘人的出现将她的生活搅得一团糟。根据神秘人提供的种种线索，苏莹震惊的发现，原来程峰回的真实身份是苏莹曾经的同学林强，而可怕的是，在苏莹的记忆里，林强早已在一场大火中丧生。曾经的青葱岁月中，苏莹和名叫江重云（金泛 饰）的男孩之间有过一段甜蜜青涩的感情。江重云总是在背后默默保护着苏莹，而他本人却不愿意承认，这让苏莹十分感动，两人计划考上同一所大学，携手步入美好的未来。化学实验室里一场突如其来的大火将苏莹和江重云的所有幻想都焚烧殆尽，火灾中的遇难者正是林强。
回复 :“石头”石振邦（张译 饰）和杨武（潘斌龙 饰）这对落魄兄弟经营五金店艰难维生，为追讨欠款，他们不得不暂时照看欠债人的孩子芊芊。两人在与芊芊的相处中从最初嫌弃“拖油瓶”竟潜移默化地转变成千方百计“为女儿战斗”，生活粗放的他们内心也变得越来越柔软……
回复 :一名曾经炙热的拳击选手（朴成雄饰），在比赛过程中导致对方死亡，在监狱服刑后想要诚实生活；而他的一位朋友（吴代焕饰）却在不择手段地想要获得成功。两个男人清算了过去，在过上新生活中，为选择不同道路而萌生了残酷阴谋，也导致了背叛。
回复 :To Elena, existence is an effort—not only does she struggle against her body affected by Parkinson’s, but her daughter has just shown up dead and only she finds the suicide hypothesis implausible. Elena is not a good victim, and doesn’t show signs of having been a selfless mother. She is vulnerable, but also overcome by rage and sorrow, and that stubbornness seems to render her invincible, against all odds. But investigating the reasons for her daughter’s death soon becomes a trip through memory, and, as we’ve known since the time of Greek tragedies, every investigation is, deep down, an investigation about oneself. Elena Knows submerges us in the physical and mental experience of its protagonist and, at the same time, invites us to ask ourselves uncomfortable questions about aging, the complexity of mother-daughter bonds and the weight of those mandates women drag the same way Elena drags her feet.
