The plot is exciting and full of unexpected twists, the characters are very well developed with unique personalities and stories, the action is intense, and the art is impressive with excellent detail and quality, plus, I like how the relationship between the characters is explored and how they evolve throughout the story.
I have read it more than five times, both the webtoon and the novel and I still love it so much.
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My favorite part is when Yohan is the one who takes the initiative in intimacy when he is the one who is disinterested in it hahah.