I loved this. I loved the pacing, the tension, the interactions.
Isaph as a main character was a character I could root for. This was someone who had lived a life of misfortune, but still able to keep kindness in his heart.
I liked how the side characters changed slowly as they started to spend more time with Isaph, even as Isaph himself didn't change. It was the side characters updating their impression of Isaph, and I liked how the story showed this in their words and treatment of him.
The ML for this story was perfect for Isaph. And even his behaviour near the end was believable given what he had to witness, and he personified the words "desperately devoted" to me. I loved their romance too, even if it's mostly left for the ending and side stories.