Well, without having read 'viviendo con el emperador' web novel, we can only speculate. It may tell a story of a common person who suddenly finds themselves in the presence of an emperor. This could lead to a series of adventures, like getting involved in palace conspiracies, or learning about the emperor's secrets. It might also be about the cultural and social aspects of the imperial era that the characters are living in.
Finding the 'viviendo con el emperador' web novel can be a bit of a challenge. You could try doing a general web search using search engines like Google. Include the full title in the search query. If it's a relatively unknown web novel, it might be on smaller, more niche web novel communities or forums. You can also ask in online groups dedicated to web novels if anyone has come across it.
His bandmates would likely be involved. They might be the ones who first notice Jungkook's headache. For instance, Jin could be the mother - hen figure, trying to get Jungkook to rest and making him some herbal tea to soothe the pain. J - Hope could be the positive energy, trying to cheer him up and make him forget about the headache through his jokes and antics.
One thing that might make it different is the theme of 'the taste of love'. It could be that the author approaches the concept of love in a more unique way compared to other fanfics. For example, it might focus on a more mature or complex understanding of love rather than just the typical puppy - love scenarios.