Melancholia

Both series focus on the lives of a group people very much passionate about engineering and maths. Start-up has programming as a central theme, here we have Maths and Calculus. Both have MLs who are geeks to begin with. The OSTs give a similar vibe as well!

Both Melancholia and Lost are TVN's 15th and JTBC's 10th aniversary projects, respectively. Leads have overflowing chemistry and share a special bond, portrayed over a beautiful story with amazing cinematography. FL and ML have a similar age gap. Both are slow burns where leads deal with alot of suffering and heal each other.

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.

In Melancholia, Baek Seung-yoo (Lee Do-hyun) is a former math prodigy who entered MIT at age 10 but became traumatized and voluntarily dropped out, completely withdrawing from the mathematical world.

Melancholia, math teacher Ji Yoon-soo (Im Soo-jung) notices Seung-yoo's hidden genius and helps him overcome his severe trauma to look at math with joy again.

Melancholia centers its entire tragic midsection on a false, malicious scandal involving a teacher-student relationship cooked up by corrupt school board members to ruin Yoon-soo and Seung-yoo.

Absolute Value of Romance (2026) is a lively, fast-paced romantic comedy and tvN’s Melancholia (2021) is a poetic, intense melodrama,If you look past the differences in tone, the two dramas are deeply intertwined by a highly specific subject matter: the world of mathematics

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 .

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