Black Knight is, different to say the least, and most of it not in a good way.
The show has an interesting premise, where the Joseon past comes together into the present over an epic tale of revenge and love. The execution however leaves much to be desired.
While Kim Rae Won is the strongest aspect, even he couldn't shave a show where the rest of the cast was weak both in writing and acting. The plot in general was weird, being super slow paced and having little character consistency throughout. Motivations made little sense, actions even less so.
But the biggest issue was the directing, where the focus always seemed a little blurred and there were weird moments scattered throughout. It did the bare minimum and any creative choices were fairly baffling.
Only really recommended for fans of Kim Rae Won and even then with liberal use of the fast forward button.