To be honest my experience with Korean BLs only tells me that many are pretty bland(for lack of better words). I know that it is still an emerging category for Korean dramas and all of them have been pretty enjoyable especially to watch in between episodes of other dramas I am watching, but this one was great from beginning to end.
The summary for this here is a pretty good one, so I won't reiterate it and I think that the best part of this comes from the casting. I think they all acted their roles strongly especially Park Jaechan. Characters that are robotic-like can easily be overacted or underacted if the actor doesn't put enough thought into it, but I think that Park Jaechan did it especially well. You could see his thoughts and actions changing bit by bit throughout the episodes and by the end, he became a more open version of himself. It didn't happen too quickly and his change wasn't overexaggerated just in the small details which makes it even more realistic.
Like I said before I think the whole cast was pretty great, but I wish they could've been shown a little bit more. If the drama was just a bit longer I think that I would rate this drama 10/10. I know that it is based off a web novel that I have not read yet(planning on it), so I don't know if it is possible.
It is only 8 episodes so even if it is not your thing to watch it won't be a waste of your time.