20th Century Girl

Zhang Jing Yi is the FL in both. The chemistry is natural. The relationship had depth. However, BEITD does not have a satisfactory ending.

youth and school drama with the setting time in the past. it's about first love, separation and a closure.

Despite a bittersweet twist, "20th Century Girl" is a captivating journey of first love in 1999, where a high school girl embarks on a mission to help her friend discover everything about her crush, only to find her own heart entangled in the process. Filmed with stunning visuals and masterful direction, this movie is a nostalgic treat. Prepare for a rollercoaster of emotions! You'll laugh, you'll cry, and you'll be left cherishing the memory of Bo-ra and Woon-ho's beautiful, yet bittersweet, love story.

both take place in the 19s and had a tragic ending. both couple met because the FL friend ask them for help (in a different way)

Both flashback between the present day and their high school days eventually closing the gap between the two periods. The main leads in both constantly reminisce about the past. If you don't mind crying as I did for First Love, 20th Century Girl is a good watch but be prepared with extra tissues!

This movie is the first one that came to my mind when I was watching 20th CG.
It has that 90's vibe too with a broadcasting theme. Also has the email form of communication.
Coming of age, young love, nostalgic feels and Romcom.
There's also a separation period, multiple actually, but they always found eachother.
This has a good ending.
ML is Jung Hae in too, if you're a fan.