at the end once the cure is discovered you get a choice to spread it into the tunnels or your capitol. If you choose capitol it doersnt seem to spread the cure. Might be related to my capitol not having neighboring provinces with the rot. When i choose the tunnels the malice slowly decline and dissapeared realm wide. Some hidden numbers here Appearntly.

引用自 Kinakin：

at the end once the cure is discovered you get a choice to spread it into the tunnels or your capitol. If you choose capitol it doersnt seem to spread the cure. Might be related to my capitol not having neighboring provinces with the rot. When i choose the tunnels the malice slowly decline and dissapeared realm wide. Some hidden numbers here Appearntly.

So I need to wait until the cure is discovered...thanks for clarification.
But it's terrible =(
I literally couldn't do anything without cheats on money: no trade income, almost no tax income. I will pray for update =\ It's not playable.