Someday or One Day (2019)

Both are Taiwanese drama/ movie with similar settings - high school, time travelling lovers. Even the female leads' hairstyles are similar lol

I just seen 'a time called you' drama recommendation so I thought 'why not adding the original adaptation

Both main leads time travelled back to the past and full of suspense which they must think of a way to save themselves and also for a better outcome.

Both of these dramas go over the loss of loved ones and the determination to meet them once again. Both of these dramas focus on a murder that happened, and both have a fantasy aspect.
Train is about a parallel universe with dopplegangers.
Someday or One day is about time travel and doppelgangers.
Both these dramas are beautifully made and both keep you on the edge with their plot twists while still managing to be huge tearjerkers.

Both take place in different timelines ,well executed plot,mystery, while the call is darker ;the two have similar vibes and are so good .

The year is 2019. The 27 year-old Huang Yu Xuan terribly misses her boyfriend Wang Quan Sheng, who has been missing for two years and is presumed dead. Her birthday wish for this year is to "see him."
The year is 1998. The 17 year-old Chen Yun Ru is in love with a boy who doesn't feel the same way for her. Her birthday wish for this year is to "become the girl Li Zi Wei likes."
One day, Huang Yu Xuan receives a walkman and a music cassette from an unknown person. She falls asleep listening to its songs and wakes up to see Wang Quan Sheng sitting by her side. She believes she has finally been reunited with her boyfriend, but there's a very big twist. She learns that she is no longer a 27-year-old woman but a high schooler named Chen Yun Ru, who is in the hospital recuperating from a head injury. And the man by her bedside is not her boyfriend after all, but a schoolmate named Li Zi Wei.
Trapped in what appears to be the past, living another person's life, Chen Yun Ru's death in 1999 will be Huang Yu Xuan’s death if she doesn't figure out how the girl landed in the hospital.
All the while, Li Zi Wei finds himself strangely drawn to the girl who used to be Chen Yun Ru, despite the fact that he knows his closest friend Mo Jun Jie has had a crush on her... Can true love find a way to bridge a seemingly insurmountable time gap?

characters end up in the past, reliving traumatic experiences. Both dramas revolve around a female lead that investigates the case with the help of the guy, that they are/were in a relationship with.

Both of them give me the same vibe about youth. Two leads travel through time (to 1998-1999) into a new identity and meet others' leads there. Both lightly, brain hacking and fantasy.
And both worth watching.

90's nostalgia (taiwan and thailand)
protagonist carries a walkman around
searching for the truth regarding their deaths

Both jump between past and present as one of the leads in the present tries to change the past of their high school years and prevent the death of the other lead.

Both involve one of the leads traveling repeatedly between past and present to change what happened and save the other lead, all while unravelling the mystery surrounding their death.

Both involve the FL time traveling to the past and trying to change events to prevent the death of the ML.

Both include time travel and a sweet romance. Splash splash love is a movie while someday or one day is a drama.

Both involve one of the leads caught in a time loop trying to change events and save the life of the other lead who has died in their present.

Similar fated love. Both fantasy dramas. Both Chinese. One has time travel while the other has a reincarnated lover.