I really had trouble liking the story - the scenario, romance-wise, seems chaotic : the ml. looks like a huge bipolar jerk, the protagonist’s love for her sibling appears exaggerated... at first. but it really gets better after a while.
however, for those who come for the romance : you will have to be very patient. the beginning is well... confusing with some displeasing aspects from the ml. personality. it does get better after a good while : the characters seems to become closer, their relationship appears “warmer” but can you read through 40 chapters just to finally see them touch hands ? ( not hold, touch. )
romantic aspect apart, the more “serious matters” such as politics, social crisis and religion make the story much more interesting. and those matters are how the world reveal its darker side and what push the characters to grow , they are interesting in their “role” - emperor and pope. but as individual ? not yet. it’s slowly getting here, but its... slow.
I like it though, but as I said before, if you come just for “love”, it might be boring for you.