Both are filipino movies that can be viewed on youtube for free. The story the characters from write about love are writing is also similar to im drunk i love you in a few ways, both focus on an already established relationship (in im drunk i love you its platonic, in write about love romantic) and the female lead sings so theres a few musical numbers. Also, the male lead/writer is introduced to be the writer of a movie called im drunk i hate you , so an obvious refrence to this film.
In both our main lead has had an unrequited crush on her best friend for a long time and are now being confronted with it. Both of them also have short but nice mother-daughter moments and a little storyline between the mcs other friend, who is lgbt. The osts are great as well and they just generelly gave me a similar feel and have a similar aesthetic (and i think both have lots of night and driving shots). Both star Jasmin Curtis too.