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。A surgeon (Kim Yun-Seok) doesn't have much time left due to a serious illness. His wish is to see his girlfriend who died in an accident 30 years ago. The surgeon gets 10 pills from a mysterious old man. The 10 pills allows him to travel in time to the past.