I think one of the few Korean BL's that does not suffer from the short episodes/runtime. They spaced it out well, and resolved it pretty good.
I'm not sure how to describe this feeling that's coming from this series? Sort of like everything is softened with a woozy filter. (Not literally) The tragic prince with his trusty bodyguard that is doomed to be exiled, have assassin's sent after him, and is ordered to commit suicide in the end. Who finds this weird/intriguing person who gives him some hope again, and a reason to laugh. And this student who likes art(history) who gets send into a painting, which is actually the past, to meet with this prince and is intrigued by him in his own way, and bring some of his light to him. And then the bodyguard who has off course always loved the prince, who doesn't trust the intruder at first, but learns to like him, even love him, because he brings a smile back to the face of his prince.
And in the end all 3 off them escape from the painting/past and go to the future to finish their lives their together. (They absolutely end up together in a poly relationship. It isn't explicit, but you can't convince me otherwise. They all care so obviously for eachother in their own way. )
The series manages to feel slow paced? Even though it is only 8 episodes of 10 minutes each.
They never explained why he gets send into the painting/past... but I'm not sure if it really needs explaining. Higher powers and fate and all. I'm good.