I still just don't understand why did they abandon gio because of his constitution. Its so...

SPOILER ALERT
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That old hag is superstitious af and thinks that gio's constitution is a "curse" that will affect them/ Leegang. that's why she abandoned gio at the orphanage and the only ones in the know are that woman she meets and the chief of staff of their household. Gio's bio parents actually think that he's dead. Leegang accidentally found out when he was a kid when he heard the old hag talking about it.

Oh ghaaad that's awful to think that its a curse. The real curse is that old hag. A witch that needs to be gone and punished. Jeez

Thanks for the spoiler btw I do really appreciate it ٩(๑❛ᴗ❛๑)۶