It’s possible either their on break or he already graduated. It’s a little over year since Kayden and Jiwoo met. Jiwoo was around 16 at the start with the rest of his friends being 16/17. Now Jiwoo is probably 17 or 18 if his birthday passed. It doesn’t give that much of a time other how long their training for or when their fights.
Tr, but like someone said before it’s webtoon, it has its own laws and system, including the education system. I’m guessing that it’s not relevant to the story if they graduate or not. Not to mention none of them seemed have studied, when college/university is around the corner, with them being in their final year of high school. If this was following the real world, they would be studying for the national university exam that happens every year. There’s also the military service that all the males have to do. Idk if this webtoon is going to do it or forget about. Considering the others have went off to train and Jiwoo will be busy fighting protégés/children of the top 10, it’s ignoring all of it and going with it’s own agenda.
Is he not going to School anymore ??