I actually watched the show a second time, just to check if there are any clues in the beginning (or somewhere before the last episode) to what is happening. There are not.

And that's the least of the show's problems.

But first: What I liked:
* All of the actors played everything straight and took their job seriously.
* The funny scenes made me laugh, the cute scenes made me smile, the serious scenes were sombre.
* There were no technical issues.

But the story. Oh my.
I think the first, and most relevant, issue is that we as the audience do not get any clues that this is not supposed to be anything but one of the usual BL romances (or romance comedies).

Also, the production doesn't stick to one "genre" -- between scenes the mood jumps from serious to cutesy to plain silly.

The show could have been
-- either: a serious, heartbreaking story about a relationship that's come to its end, and how the couple deals with it, and maybe find a new way to be together,
-- or: a cute, maybe a bit trope-y story about a couple that tries to balance their relationship and work / college with cheesy slice-of-life-scenes,
-- or: a silly, over-the-top story that makes fun of alle the tropes of het and BL romances, maybe with some slapstick thrown in.
Considering the quality of the technical aspects and the acting (and, again kudos to all of the actors), either of the three genres would have been great!

I suppose this show was conceived as a parody, which is the only thing that would make at least some kind of sense -- but the audience needs to get clues what this show is supposed to be!
As it is, the show does not know what exactly it is (what it is is a mess) and leave the audience not only confused but also disappointed.

[this is a slightly edited version of my review on Viki.]