This is one of the best BL I've ever watched. The actors achieve to convey emotions through their eyes. To me the plot is basic but their performance, the music and the atmosphere makes the charm.

Carefull SPOIL :
I just cried for the last 20 minutes of the last episode. Just based on the music and the actor's performance understanding their emotions is so easy without talking much. Seeing Tian so sad and disappointed that Sheng leaves the class and knowing the reason why Sheng leaves it shows such a dramatic moment.

I really hope they will announce a season 2