This series has absolutely become my comfort series.
I have watched the series twice and the movie (which is just the series pasted together) also twice and then i watched some of the anime episodes.
Why? Maybe that's a little bit part of the tism but iin all seriousness: why is it so addictive?
Semantic error shouldn't be addictive tbh: it uses the almost all the age-old BL drama tropes such as enemies-to-lovers, colege romance, grumpy x sunshine, straight guy falling in love with a guy etc. etc.
And yet! Though it uses these tropes - which isn't necessarily a bad thing, it manages to captivate the audience (me). I think that's due to the script: the script is really good in terms of drama and comedy. there wasn't a single moment where i felt like the dialogue was bad/cringey/lacking/out of character. The script made sense! Which is something that is often lacking in college romance enemies to lovers BL (2gether, fish upon the sky for example) And i think that's what made it so refreshing and addictive.
On top of that, the cinematography was really pretty and the acting and chemistry between the two leads was also very good.
All in all, this is a very fun watch and definitely needs to be on your list if you like romcom series with the grumpy x sunshine trope!