This is a BL that had the potential to keep people hooked and be breath taking IF it was 6 episodes instead of 12. The original story idea of parallel universes was unusual and great and the director managed to give a continuous atmosphere in the show that I have not seen in any BL, the closest I can describe to is the anime Noragami (if you are into anime you will get the reference).
The protagonists are good looking and their acting and chemistry is above average. The reasons why I lowered the rate:

1. There are way too many filler scenes between the friends and the protagonists that I ended up having to skip that offered ABSOLUTELY NOTHING to the plot except filling up episode time. I skipped them and didn't miss any information.

2. Completely unrealistic professional setting and people pretending to work on a movie that was so detached from reality that ended up annoying. I understand that it's not the focus of a romance show, but still, every episode was them working for 5 min and then a 20 min scene of celebrating their progress at the park/ bon fire/bar etc. Lame.

3. There should have been more explanation/back story to the travelling between universes, it started well with the support group and then it got abruptly dropped/minimized.

4. They had a chance to show the other people who travelled in the universe and their decisions but it was all focused on the original couple and their unnecessary scenes with friends.

You can have a good time watching it as long as you have the skip button ready to avoid the nonsense.