All About the Duke

Read manhwa All About the Duke / 공작님의 모든 것
Elia, a young woman from high society who goes in search of the missing Winston, the duke of a distant kingdom, at the request of a friend. She discovers that he is a powerful wizard who turned into a child because of a spell. She decides to take care of him and try to reverse the curse, but ends up getting involved in a series of adventures and confusion.