I-hsin finds out fiancé Li-yang frequently seeks therapy at a psychology clinic named “Time Travelers”, and decides to visit it herself to see what it’s all about. She is reluctantly given a hypnosis treatment and enters a hyperreal dream. In this alternative reality, she has turned down Li-yang’s proposal and instead chose her senior in college, Kai, whom she had a secret crush on. In this divergent timeline, she marries Kai and carries his baby, feeling so incredibly happy that she questions if she made the right choice in real life.After waking up, I-hsin becomes anxious about her imminent marriage and grows attached to Kai. Li-yang was devastated by her rejection and got seriously injured in a car accident in this parallel universe. Seeing the traumatized Li-yang, I-hsin realizes this caring and loving man is the one she really needs, and resolves to save Li-yang in both universes, as well as their relationship.
以歆發現未婚夫力揚頻繁地出入一間名為「時空旅人」的心理診所。到診所一探究竟的以歆被醫生進行催眠診療,進入一個夢境,在夢中她拒絕力揚當年的告白,轉而選擇學長阿凱,兩人結婚、懷孕,幸福的時光不禁讓以歆懷疑自己的選擇。
現實中的以歆對結婚感到焦慮,兩人決定暫時分開。然而力揚一直無法放下深愛的以歆,過得並不順利,以歆才終於明瞭自己最需要的是深愛自己的力揚,因此下定決心要拯救所有時空的力揚與自己的感情。