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.
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.
Maybe the plot development is a bit confusing or the character designs don't appeal to everyone. It could also be that the story pace is off for some readers.
Perhaps there are issues with the consistency of the world-building or the way the relationships between characters are portrayed. Also, the level of drama or comedy might not hit the right mark for some.