Loving A Heartless King (Nozel Silva x fem reader)

(Read the description first to avoid misunderstandings !)
The action happens in a parallel universe, where magic is possessed by a few, most of them royals and nobles.
There are nine kingdoms in this world: Silver Eagle, Crimson Lion, Blue Rose, Black Bull, Gray Deer, Coral Peacock, Purple Orca, Green Mantis and Golden Dawn. All of them are ruled by humans with incredible magic (the captains in the Black Clover).
The Silver Eagle Kingdom is ruled by the mercury magic possessor, Nozel Silva. He is known as the coldest king of the Great Nine Kingdoms . Even if he rules the kingdom well, he isn't very loved by the citizens, but instead, he is respected and feared by them.
How can he fall in love with a commoner and how he will take care of her and his kingdom?