A South Korean Netflix TV series Romcom from 2023. I only saw the trailer. According to
Wikipedia, it
was one of the highest rated dramas in Korean cable TV history.
Thanks to Timofte Nicolae for suggesting the movie.
MOV, OggWebm.
IMDB link
For the poster, some quantum mechanics formulas like the Schroedinger equation appear:
Some calculus boards. The first scene had it flipped to make it look more impressive.
It is just linearity of sums and integrals: