Meet Me after School

20 years ago, Kei, a 23 year-old highschool teacher, fell for a student, Hitoha, a beautiful girl, but lost her from a tragic car accident. He’s now a middle aged factory worker who has just quit the job to visit Klavan in Ukraine. There lies a beautiful railway called Tunnel Of Love, where people say you can meet with your deceased beloved one. A freight transport runs once a day and it is said that the train takes someone you wish to meet

Both are sweet stories of early love and how it stays with people even as they grow older. They are both real and raw.

A younger guy falling for an older female teacher. However one is a student while the other is a professional dancer.

both are extremely good in their own way. There are differences but follow a similar theme ie older woman x younger guy

Same female teacher and younger male student. While chugakusei nikki is more melodramatic, biscuit teacher and star candy is more funny.

Min Ki is an unemployed banker. He now takes over the domestic roles of the house: cooking, cleaning, and watching the baby. In his free time, he watches soap operas and reads romance novels. Meanwhile, his wife Bo Ra works at an English language institute and is having an affair with a former lover. One day, Min Ki accidentally stumbles upon a key, that belongs to his wife, and is unfamiliar.

Features a relationship between a teacher and her student, with the student being the initiator. Takes a generally positive view despite lots of drama involving parents, school staff, and the teacher's fiance.

Narita Misao is a rookie employee at a company. She doesn’t like Ichikawa Kazuya, who works in the same department. He is brutally honest when he talks to other people. Nevertheless, an incident leads to Narita Misao developing feelings for him. Ichikawa Kazuya also becomes attracted to her. The couple soon enter into an intimate relationship, but Narita Misao learns afterwards that Ichikawa Kazuya is engaged to his girlfriend. Narita Misao is confused by the situation and wonders what he is thinking.

Both dramas have obsessive male leads who are withdrawn and angsty. The only bright spot in their lives is the female lead. They're both very protective of her. In both dramas their whole lives & every decision they make revolves around her.

Narita Misao is a rookie employee at a company. She doesn’t like Ichikawa Kazuya, who works in the same department. He is brutally honest when he talks to other people. Nevertheless, an incident leads to Narita Misao developing feelings for him. Ichikawa Kazuya also becomes attracted to her. The couple soon enter into an intimate relationship, but Narita Misao learns afterwards that Ichikawa Kazuya is engaged to his girlfriend. Narita Misao is confused by the situation and wonders what he is thinking.

The Ml is high schooler 17 and Fl is 27
Both Male leads are nice
The Female lead is not teacher but in some way is as he fixes the rich brat kid Male lead.
The second Male lead is very capable.

The stories aren't similar, but the filming techniques are alike and both have the same type of feeling.

Both are teacher-student romances with a gloomy, somber tone, complex, well-written characters, and strong performances.

"Rikon Doukyo" centers around husband Konaka Masaru and wife Ichinose Naoko who seem to have a happy family life. All this comes to a seemingly abrupt end when the couple decides to divorce. Yet, the couple soon finds themselves living together again even though they are no longer married ...

This is Korean vesion of this drama.
Not ocmpletely the same storyline but both reveals a relationship between a minor and a teacher.