While it can be debated whether this really fits the themes of a classic BL, the story, if you're into angst, is one to watch for. Yes, there are some plot points which make you wonder the realism of it all (such as financing of the restaurant, taking long breaks from work, etc), the core story is lovely.
The overlying themes of self-sacrifice -- the extent and the ways of self-sacrifice -- are showcased really beautifully here. If you're okay with watching something painful, and raw with a happy ending, this is the show for you!

PS: Kudos to the actors for singing songs in this, so so cool!