Someday or One Day

Huang Yu Xian lost her boyfriend from a plane incident two years ago. She misses him a lot and sends messages with no reply. Meanwhile, her colleague claims there is an app that can find someone who looks identical to you.

Huang Yu Xuan is shocked to find out that her boyfriend was planning to propose to her. Meanwhile, through Ah Tuo's app, she finds a photo that has a woman who looks exactly like her and her boyfriend is beside the woman.

Going to the past year, 17-year-old Chen Yun Ru meets her school friends Li Zi Wei and Mo Jun-Jie. Back to the present, Huang Yu Xuan is disappointed to find out that the man in the photo is not her boyfriend.

In 1998, Chen Yun Ru is unconscious in the hospital after a stranger's attack. Meanwhile, in the present, Huang Yu Xuan falls asleep listening to an old tape and wakes up, becoming Chen Yun Ru.

Chen Yun Ru thinks her being Huang Yu Xuan was all a dream. Meanwhile, Chen Yun Ru, Li Zi Wei and Mo Jun Jie try to find the attacker.

Huang Yu Xuan finds herself back in 2019, and although she goes to a mental hospital, the doctor does not believe her. Meanwhile, she receives Chen Yun Ru's diary from the 32 Cafe's owner.