Responses

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The blonde ghost is the actuslly the previous emperor. Don't know the details but I think Ronan must be the current emperors brother or something. You notice that Ronan knows literally all the nobles and the imperial family members. Also he must've been really young when he died or something since he looks so young.
The first theory is I think the blond ghost is not dead yet and is actually another prince that fell to coma and is being kept secret for 2 reasons maybe. One, is that he is so ill that he fell into a coma or Two, he is like Roanne that can communicate with the dead or holds special powers he was locked away and fell into a coma.
It was actually very very suspicious how the other ghosts knows majority of what the hell is going on with the castle and the lives of other ghost they associate themselves with but they don't know nothing abt him and who he is, just his name, yet he knows everything abt them.
My second theory is that he is dead but his standing may have been equal to a prince that was betrayed and persecuted unfairly the reasons may still bary between those two reasons from the first theory.
I hope y'all understand tho, tell me if you want me to explain why i thought of if further.