Melancholia (2021)

Both dramas are all about having a sexual relationship between a teacher and a student with an age gap also.

Kuzu no Honkai and Melancholia both deals with teacher who have some sexual relationship with their student and age gap also.

In both dramas the ML is younger than the FL. The FL at first sees him only as a boy and doesn't consider him as a possible male partner because of the age. The ML falls in love with her first and tries to make her love him back and see him as an adult.

quite suprised no one thought of this comparison before!
Both dramas has the same environment- school for rich children.
the female lead is an outsider in some way - not rich and hold different perspective on school life.
there is a love realtionship developed between male lead and female lead .

*Student-teacher relationship

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*Age gap

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*Younger man, older woman

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*Support of the teacher in the student's success

Both of the dramas' main leads are math teachers and a lot of maths are shown in both of the dramas.