One common theme is friendship. Many Chen Baek fanfics explore the relationships Chen Baek has with his friends, how they support each other through tough times. Another theme is self - discovery. Chen Baek often goes on a journey to find out more about himself, his values and his purpose in life.
Again, without knowing the details of the 'Miss Baek real story', it's hard to determine its significance. It could be significant to the people directly involved in the story, or it could have a broader meaning in a cultural or social context if it highlights certain issues or values.
I'm not sure which 'Baek' novel you specifically refer to. There could be many characters in different novels by an author named Baek who could potentially be considered the best teacher. It might be a character who imparts great wisdom, or one who has a profound influence on the protagonist's growth.
One common theme is friendship. Baek In Ho's relationships with his friends are often explored in fanfics. Another theme could be his struggle and growth. Since he has his own challenges in the original story, fanfics might expand on how he overcomes them.
There are 'baek fanfic' stories that revolve around a fictional relationship of Baek. These often create interesting scenarios where Baek interacts with other characters in a romantic or platonic way, depending on the plot. For example, a story might have him meet a mysterious stranger and the adventures they go on together.
As I don't have information on this Doctor Baek Kwang Hyun, I can't say for sure. He might have had achievements like finding new cures for local diseases, improving medical facilities in his area, or training other medical practitioners.
Love is a very common theme. Given the relationship between the characters, fanfics often explore their romantic interactions in different scenarios. Another common theme could be self - discovery, as the characters might grow and learn more about themselves within the fan - created stories.