Twelve Letters

Two souls find each other in the darkest times of their lives, becoming a support, a guiding light, a hope for each other.

Both the dramas have aspect of different timeline and space. The settings of both drama is calm and wholesome and if you liked Twelve letters, you should definitely check out Someday or One day.

Similarities:
- Both center on a heartfelt romance that grows stronger through different stages of life.
- Feature main couples who support and inspire each other during their hardest moments.
- Show characters facing emotional struggles while trying to protect the people they care about.
- Mix light, sweet scenes with moments of real sadness and reflection.
- Highlight the importance of second chances and not giving up on love.
- Include strong friendships that guide the leads through confusing or painful times.
- Focus on personal growth, healing, and learning to communicate honestly.
- Use meaningful letters, memories, or time-shifted moments to connect the characters.
- Give the story a warm, comforting tone even when dealing with heavy themes.
- Explore how time, choices, or attempts to change the past can shape the characters’ futures.

If you like dramas with elements of fantasy like time travel but with the focus being on the characters, their friendships, romances and, life, these two dramas have a good balance of that.
Both dramas include:
1. stories centered around troubled youth/unconventional or unhealthy family dynamics
2. an elements of travel/connection between timelines/parallel worlds
3 a tragedy connected to regrets of the past
4. gangster villains
5. found family/tightly knit group of friends
6. lighthouses...
7. striving to get into university
8. young love
9. special retro vibe, beautiful aesthetics and small town core
10. self-sacrificing male leads

Both deals with letters from the future. Leads trying to change the future, past highschool setting, friendship, romance..

There's no investigation/detective in twelve letters but the mystery , angst and communicating with past/future kind of reminds me of signal .

Both has to do with letters. Mystery letters, each letters has deep story. Letters written by heart and soul. Both are heartfelt heartwarming movies

Both are heartwarming good story. Both has written notes/letter that can touch your heart. Both dealt with life/generation experience, romance etc

In "I Belonged to Your World", the FL's son travels back in time to prevent his mother from having a bad life. I got that same sentiment in "Twelve Letters".

In both dramas, the sons of of the FL's are selfless about their parents.

Both are love story involve letters and a mailbox. Sad, heartbreaking, love story. Some mystery, life experience, family, generation, life span …

Twelve Letters and Last Letter both center on the power of written words to connect hearts across time. Each uses letters as a bridge between past and present, blending nostalgia, mystery, and emotion. They share a quiet, reflective tone, showing how even simple messages can carry unspoken feelings and change lives.

Both has to do with the letters, mystery mailbox, mystery letters. Letters full of soulful stories. Life span, life experience, doesn’t matter if letters deliver, it is written from the hearts

Both are romance story. Written words bring them closer and togethers. Strange way, difficult way, heartwarming, heartfelt love story

Both of these feature a mysterious time line, intertwined fates, a love story, heart wrenching scenes and great writing

Both are slice of lift, grew up together. Both main leads had to endure hardship, tough encounters, difficult childhood….