Maybe it's because of its popularity and wide appeal. Many people around the world want to read it, so it was translated into English to reach a larger audience.
The reason could be that an English version would make the novel accessible to a much larger readership. It gives English speakers the chance to discover and appreciate the story. Plus, it could lead to more discussions and fan communities around the world.
Secretary Kim manga is popular for several reasons. Firstly, the art style is visually appealing. Secondly, the storylines are unique and full of surprises. Also, the character development is deep and makes you care about the characters.
It might have translation errors that affect the understanding of the story. Also, cultural references could be lost or misinterpreted in the English version.