人生不能重來，但是可以改變。妳對另一個選擇感到好奇嗎？ 坊間盛傳一間名為「時空旅人」的心理診所， 利用催眠結合占卜，計算出平行時空的人生發展。 范以歆和交往七年的男友何力揚準備步入禮堂之際， 卻意外得知大學單戀的學長邱凱翔，遲來的答覆： ──當時我的答案是喜歡。 她的內心為之動搖，接受占卜，更看見平行時空的自己和學長婚後的美滿生活。 雖然醫生告訴她另一個時空並不存在： 「那只是夢，只是妳人生的另一種可能，全是靠潛意識塑造出來的結果。」 她開始耽溺於兩種愛情，游走在兩個世界，真實生活逐漸受到影響。 婚禮將至，當范以歆決心放棄穿越時， 赫然收到一張來自平行時空的紙條，上頭寫著──請妳救救他。 是她的筆跡，是另一個時空的她留下的求救訊息！ 原來平行時空確實存在！ 救救他？「他」又指的是誰？ 這兩個時空裡，她所愛的人竟然都將面臨一場無可避免的意外……

We cannot reset our lives, but we can change them. Are you curious about whether there are other options in our lives? There is a psychological counselling clinic named "The Time Traveler," which is well known among the people that live in the area around the clinic. The clinic combines hypnosis and divination to show you a parallel universe and how your life has developed there. Yi-Xin Fan and Li-Yang He have been together for seven years, and are going to get married. However, Yi-Xin Fan suddenly learns that Kai-Xiang Qiu, a classmate from university that she had a crush on, has actually felt the same way about her. Her mind is wavering when she turns to divination. She sees that she and her classmate are happily married in the parallel universe. However, the doctor tells her that the other universe does not truly exist: “That is just a dream, another possibility of how your life could have been, all created by your sub-conscious." Now she is indulging herself in two relationships, wandering between two worlds, which gradually undermines her real life. With the wedding fast approaching, Yi-Xin Fan makes up her mind to give up traveling through time and space, but to her surprise, she receives a note from the parallel timeline. The note says, "Please help him," and it is written in her own handwriting. It is a message of desperation from the "other her" in the parallel universe! Immediately she realizes that the parallel universe truly does exist! Help him? Who is the "him" in the note? In both universes, the ones she loves will face unexpected accidents that they are unable to avoid.