该片改编自在全球22个国家出刊的畅销小说家纪尧姆·米索（Guillaume Musso）的同名小说。讲述的是一位医生重返过去和数十年前的自己相遇，为了拯救已逝的恋人而往返于过去和现在的故事。金允锡饰演现在的男主人公，而卞耀汉则饰演过去年轻时的男主人公。
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