Student - teacher/mentor relationship in high school/Catholic boarding school. Difference is genders - in one teacher/older is woman, in another man.

Both are light and really nice watch. In both dramas student is very cute, quite popular/active, playful/trouble maker, with lovely facial expressions.

In both leads have very good chemistry, relationship development and despite age/status difference it doesn't shown as much taboo / "cross the line" feel.

Both same vibe dramas about student / teacher relationship in high school.

Both are light and really nice watch.

In both leads have very good chemistry, relationship development and despite being taboo subject, in both dramas you don't have "cross the line" feel.

In both dramas student is very cute, quite popular/active, playful/flirting, with lovely facial expressions. Also because of crush on teacher becomes class president, though before never cared about school activity or study.

Difference is genders - in one teacher/older is woman, in another man.

Relationship between a male student/sportsman and a female teacher/coach, age gap (but not very big).
both are sweet, beautiful romance developments, with beautiful FL and lovely ML.

both are mini series (overall 4-5 hour watch) and not dragged.

Both dramas are about a relationship between a male student and a female teacher, age gap and forbidden love.
Secret Love Affair is more mature and much serious/high quality drama.

Both dramas are about a relationship between a male student and a female teacher in high school, age gap and forbidden love.
Majo no Jouken is more dark and involves sexual relationship.

Both dramas are about a relationship between a male student and a female teacher in high school, age gap and forbidden love.

not similar plot, but:
***same actress and actor as mains and almost same chemistry (Bie Thassapak & Fah Yongwaree)
***love triangles, love squares
***in both dramas major part of plot is infidelity (in both ML has mistress, in one drama our FL is wife, in another mistress)
***in both dramas mistress becomes quite obsessed/afraid to lose ML in second half of the drama.

Both are practically movies (THOD is mini series but has movie vibe). in both:

***Infidelity and love between people who are married/engaged.
***Tragic / forbidden love
***century ago time period (approximately)
***main plot is love/romance but also very well shown "war time" (in one Japanese occupation, in another Vietnam war)
***some dark vibe but also beautiful and great cinematography.
***amazing chemistry between leads.
***sexual relationship (though it's more shown in "obsessed" which is 18+ with amazing sex scenes)
***Both have POV from the ones who cheat and those relationships aren't shown as "bad thing", but both dramas also show what damage can this cause for them and people around them.

Both about infidelity and love between people who are married/engaged to other people.

Both have sexual tension and good chemistry.

**Both about infidelity and love between people who are married (in Club friday FL isn't married) to another.
**Both have POV from the ones who cheat and those loves aren't shown as "only bad", though both also shows what damage can this cause, how painful is it for cheater spouses.
**in both main leads are very beautiful, have really good chemistry and sexual relationships (sex isn't taboo, but in "Obsessed it is fully shown and is really 18+).
***Obsessed is movie, much darker and also much better/different level. it's also not modern time. really great movie.

Both about infidelity and love between people who are married/engaged to another.

Both have POV from the ones who cheat and those loves aren't shown as "only bad", though both dramas also shows what damage can this cause, how painful is it for cheater spouses.

Both dramas are quite realistic/real life stories.

in both dramas main leads have really good chemistry and sexual relationships (sex isn't taboo in those dramas).

Both about infidelity and love between people who are married/engaged to another.

Both have POV from the ones who cheat and those loves aren't shown as "only bad", though both dramas also shows what damage can this cause, how painful is it for cheater spouses.

Both dramas are quite realistic/real life stories.

in both dramas main leads have really good chemistry and sexual relationships (sex isn't taboo in those dramas).