Blue Birthday (2021)

Going back to past for her first love. Limited chances to go back. In Operational Proposal also Male Lead go backs to meet Female Lead to propose. But He loses chance then he go backs to propose. Same as Blue Birthday there are limited number of chances to go back to past to modify present

Both has time travels, “death”, heartbreak and also first love. Except from languages, most of the descriptions sounded similir.
Someday or one day:
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."
Blue Birthday (My summary):
Oh Ha Rin’s birthday wish was that she wished her boyfriend didnt died on her birthday. Oh Ha Rin will revisit the past through mysterious photos left by her first love, Ji Seo Jun who died on Oh Ha Rin’s 18th birthday.
Blue birthday (actual detail):
A fantasy romance drama in which Oh Ha Rin will revisit the past through mysterious photos left by her first love, Ji Seo Jun who died on his birthday 10 years ago. He had resolved to confess to his childhood friend since elementary school but he ended up taking his own life, much to her shock and horror. He was about to confess to her when he met his sudden death in the photography room.

without the time travel, they seem pretty similar and have the same vibes .............................................

The leads travel back to the past in both dramas (although for separate reasons)
both are high school dramas
male leads in both dramas are optimistic

Both dramas talk about how female leads are high schoolers and have been traumatized by their past birthdays due to events that had happened on that day. They slowly try to figure out what actually happened on that day with the help of the male lead.

Both dramas are high school teen stories with Similar editing style, coming of age stories, about high school students and their relationship

Both are school drama......
Both story contain return to school.......
Both drama have sad scene.......

Both are short length dramas in which the leads are classmates and right when one is about to confess, the other dies tragically. The remaining lead discovers some objects left behind (photos vs. candles) can be burned, allowing them to travel back in time for a little while each time. They then try to change the past and save the person they love.

Both drama have school mystery and struggle of student.............i find them Similar...... That's it!............

Although different in genres and setting (Blue Birthday is a high school based romance, 365 is more pure thriller), they both have a similar premise of going back in time to save a loved one. They also have some similar twists (although I wont say more so as not to spoil). Blue Birthday is more light-hearted while 365 is more dark and suspenseful, but if you're looking for a similar set-up and don't mind the tone changes, give it a go!

similar plot/
in let me off the earth male lead experiences time loop and trying to change the story that happen again
in let me off the earth male lead knows whats going to happen in next and even in blue birthday female lead knows whats going to happen next and trying to change ....

In both dramas there is time travel: in Blue Birthday by burning a photo, in Nine by burning a stick of joss.

In both dramas you travel to the past through photographs in order to conquer your first love.......

Both are mini dramas in which the FL time travels to the past/her school days and tries to change the past to save the ML who she loved and who died back then.

They are quite similar as they involve familiar things like - having a crush , the thing with the photo, in Seishun cinderella, she tears the photo and goes back in time, in blue birthday, she lit up the photo and goes back in that particular moment. The stories might be quite different, but are so wholesome to watch.