To My 19-Year-Old (2018)

Similar "time travelling" theme. Lead(s) travel in time and try prevent some events from happening in order to ease their regrerful hearts.

Both story tackles about time travelling
Friendship and love triangle
Story and Plot are both on point.

Sending letters to the past to change your future? both movies got your back
orange tho follows a Japanese high school setting while to my 19 year old is a Chinese youth movie set in their college days
both are sure to give you the feels tho

-similar school time romance vibes where you meet someone who you love and makes a super big impact on you
-no magic elements in OT but does have time jumps and bring you on a whole hecking journey for the main CPs
-DARREN WANG IS AMAZING

I recommend this both drama because , Male lead and Female lead
try to solve problem
In one drama explosion and another student murder/suicide

Both have themes of time travel and time manipulation.
Both have the past directly effect the future.
Both deal with love lost.

Both female leads get a second chance at their teens. The question is will they be able to change what happened in the past?

- ML died unexpectedly.
- Travelling through time and space.
- ML was in love with the FL secretly for 10 years in TM19YO and 11 years in SFOT.
- Both FL regretted later that she never noticed the ML in the past.
- After going back to the past, FL tried to fix/make up all of his regrets.

Both shows depicts the importance of youth and life's decisions with beautiful time travel concepts. Both are recommend

It uses the plot where someone's objects that holds memories of their love one, will have the abilities to let them communicate with the love one who passed on. Whether via travelling to the past etc.