I don't know who the author of 'fever king novel' is. There are so many novels out there and without more context it's difficult to determine the author.
I'm not sure specifically as there could be many novels with 'fever king' in the title. It might be about a character who is like a 'king' in a world affected by a fever, perhaps a disease epidemic or a metaphorical 'fever' such as a social unrest or passion that sweeps through a society and this character has a dominant role in that situation.
The following novels were recommended for novels similar to " Fever Reduction ":" The Ultimate Swordsman "," The Fighter of the Magic Age "," The Adorable Believer "," We All Owe Each Other a Confession ", and " Rebirth Confession: Deskmate Wants Sweet Love!". These novels were all game-game-otherworld-type or youthful-daily-type works, and the plots were touching.
Webtoon does have a few 18+ comics. However, their availability can vary depending on your region and the platform's content regulations. Some might be hidden behind age verification or specific access settings.
Fanaticism and passion were two different emotions. Fanaticism usually refers to excessive, blind, and unreasonable emotional defects in a certain thing. It is manifested as excessive addiction and obsession with a certain hobby, pursuit, or character. For example, a fanatical interest in computer games, cartoons, pop stars, and so on. Fanatic behavior may manifest as impulsive behavior that is difficult to control or reckless of consequences. On the other hand, passion was a strong emotion and inclination towards something or someone, but it was relatively more rational and reasonable. Passion was a positive emotion that could stimulate people's motivation and creativity. The difference between fanaticism and passion was that fanaticism emphasized the excessive and irrational nature of emotions, while passion emphasized the positive and reasonable nature of emotions.