Recommendations

A model student transfers to the notorious Jungmoon High School known for its severe corporal punishment by teachers and power struggles between school gangs.

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

both have fls that move to a small town after the death of a loved one
both lose their jobs
both meet a love interest who is already in the town and is involved with helping the towns
people
both show the stories of the people in the town
both show the fl's struggle with grief
both have romance

if you guys liked when destiny brings the demon you should def watch love game in eastern fantasy since they both kind of have the same plot of:
- transmigration trope
- enemies to lovers
- supernatural
- sacrifice

Lee Bo Young's character commits a crime in both dramas and is on the run from the police in order to accomplish what she believes is right, but is considered illegal.
Lee Bo Young acts as a young girl's mother.
Each episode in both are pretty depressing.

Remake; same story different actors

"Chong Sheng Tuan Chong: Da Xiao Jie Mei Tian Zai Xian Da Lian" feels more comedic than "She Runs, He Chases, She Can't Fly"

Both are Taiwanese BL dramas whereby the main love interest has a secret crush on the main character and they go through some ups and downs before becoming a couple together.

Both are BL dramas whereby the love interest has a secret crush on the main character and cunningly manipulates the main character into loving him back naturally. Love in the Air is a Thai BL drama and Secret Lover is a Taiwanese BL drama.

Both are BL dramas and as the titles of both suggest, it is a where a guy on one side has a secret crush on the other guy before them becoming a couple together. Secret Crush on You is a Thai BL drama and Secret Lover is a Taiwanese BL drama.

This drama also includes palace politics, as well as a soul from the future traveling back to historic era, sprinkled with some comedy, with a little more romance.

Both are Taiwanese BL dramas with both sides of the main couple having very different personalities. This together with miscommunication drives most of the difficulties in the BL couple relationship.

Both are Taiwanese BL dramas with a friends to lovers type of plot where one is secretly in love with the other. There are some conflicts and misunderstandings that cause the BL couples to face difficulties in their relationship.

Twose two are somewhat realistic law dramas, with a dash of romance and a lot of friendship between coworkers. In both, the viewer gets to follow one new case per episode while the relationships between the characters develop quietly in the background


However, strangers again is more heavy on the romance side, to the point of being borderline melo sometimes

The story is about Seo Joon, who loses everything to voice phishing and infiltrates the organization in China to meet Kwak Pro, the designer behind this system

Both Twelve Letters and Yesterday Once More have that same bittersweet, nostalgic feeling. They’re not just about love, but about how time changes people and relationships. In both, the romance isn’t straightforward; it’s tender but marked by distance, regrets, and missed chances. They focus on memory, growth, and the way small moments stick with you over the years. The tone is slow, emotional, and reflective, making you think about your own past and the “what ifs” in life.