دختری به نام هان جون هی یک سال پیش نامزدش کو یون جون را از دست داده اما هنوز هم با غم از دست دادن او دست و پنجه نرم می‌کند. در این میان هان جون هی به شکلی اسرارآمیز در زمان به سال 1998 میلادی سفر کرده و در بدن دختری 18 ساله به نام مین جو بیدار می‌شود. حال همانطور که او تلاش می‌کند با این حادثه غیرمنتظره کنار بیاید با پسری به نام شی هیون روبرو می‌شود که شباهت عجیبی به نامزدش دارد و…
قسمت ۱
Han Jun-hee continues to grieve Koo Yeon-jun. When she receives mysterious flowers on her birthday, she has an odd feeling that her late lover may be nearby.
قسمت ۲
While investigating her lookalike, Jun-hee receives a strange package. Kwon Min-ju develops a friendship with her crush but soon faces a huge letdown.
قسمت ۳
Jun-hee tries to make sense of Min-ju's recollections that get jumbled up with her own. Nam Si-heon discovers a new side to Min-ju.
قسمت ۴
As Jun-hee struggles to distinguish reality from her dreams, she receives an old diary that contains a shocking truth.
قسمت ۵
Back in 1998, Jun-hee's bubbly personality shines through Min-ju. Those around her begin to notice — including a mysterious figure who watches from afar.
قسمت ۶
Si-heon finds himself attracted to the new Min-ju. The love triangle grows when he decides to come clean to Jung In-gyu.
قسمت ۷
Jun-hee tries to warn the boys of the approaching danger. Meanwhile, a horrifying event takes place at school during the night.
قسمت ۸
Yeon-jun eventually finds his way to Jun-hee. He does whatever he can to enchant her, but falling in love is not as easy as it seems.
قسمت ۹
Jun-hee and Yeon-jun enjoy a stretch of happiness. Meanwhile, Si-heon deals with one obstacle after another.
قسمت ۱۰
Jun-hee vows to change the past and save Min-ju. Si-heon, while investigating the murder, stumbles upon a chilling truth.
قسمت ۱۱
Min-ju turns a blind eye to the dangers ahead and focuses on spending time with Si-heon. Si-heon and In-gyu, however, start to grow suspicious.
قسمت ۱۲
As Min-ju takes her life into her own hands, Jun-hee makes a last-ditch effort. She and Si-heon later decide to finally make things right.
