It's a novel. The story and its elements in Fahrenheit 451 are presented on a larger scale and in greater detail compared to what's usually found in a novella.
Sure is. Fahrenheit 451 is a classic. Its exploration of censorship, dystopia, and the power of books has made it an important work in the literary canon. Many readers and scholars find it to be a timeless masterpiece.
I'm not sure specifically who 'Kelvin Tan' is in the context of web novels without more information. There could be many authors or characters named Kelvin Tan in the vast world of web novels.