I'd say the webtoon is okay if you'd like a visual medium, but I preferred the novel personally. The webtoon has changed several scenes from their original context and trimmed out some important information, so I'd say - if you don't mind the read - the novel is better overall.
I also have to say, even with how long the novel is, the chapters are actually fairly short and easy to get through. I think it took me like 2 months to read it, but that was even while distracted and taking several days between reading sessions.
If it's not available where you live, the English translation is up on novelbin, but the translator changed halfway through and did a bunch of stuff to the names. Someone did post a googledrive copy with everything fixed and the original novel artist's artwork included though, so here it is (I downloaded it for better navigation): https://drive.google.com/file/d/12lGIe1DJEe8QaAIGqT1x29lf3sI_JdqP/view