Honestly, like many people, I started watching this series with no expectations because the plot seemed boring and I didn't know any of the cast, but it ended up being my favorite bl.
I think the best thing about it is the script. It's very well done, there is no part that is boring at all, that's one of the reasons why the series has really high replay value, they can be entertaining without being toxic or misunderstanding. Each episode brings something new that doesn't stretch out for long.
The music is excellent, the performances of the cast are good, especially Fourth, the chemistry is unmatched, it's also very funny without cringe and that is not easy.
Would recommend 100%