Why I do love slow burns, I am not a fan of mutliple couples, especially of the grown up sort on the side.
Two teachers are in the same boat as our MLs, but they know each other for more than 10 years and have not found the time to confess their feelings much much much earlier. This is a big downer of the whole show.
First I (and many others) assumend that both teachers where together, but much later on, we learn, that's not the case. That's also the reason why the female teacher has so much screen time.

Tians conflict is not really revealed. If you don't know the book, you don't know that he is a homophobe. The flashback in episode 11 shoulkd teach us that, but (!) it does not... yes he is disturbed what he has seen, but I would never have the conclusion that it makes him a homophobe. He also does not react as such in the two kissing scenes. So something is either lost from the book or lost in the script.

Other than that both characters are what you expect in a BL. One introvert, the other one an extrovert. Both with emotional damage. The character building was nicely done, You see that they are caring for each other and they are growing togehter. But they don't make the step to confess even when both feel the same. So the cliffhanger for Season 1 was done in the nicest way possible for the MLs, but the teachers were a disappointment.

So I personally have to disagree with "best BL 2024", I think that "Unknown" was better. It's a good show, with good acting, very good cinematography but the story is nothing we did not see already. It also has "Addicted Heroin" vibes but they resolve such a story in an other way. We get an unsatisfying ending because it looks like it was designed to have two seasons. Now we have to wait and see if we really get a second season, which is not a given.