
Im just a first year student so I cannot provide complete information, however most people who have been exposed to rabies are usually given a post exposure vaccine dose, rabies is one of the few diseases where the post exposure vaccine is more common.
Though take my words with a grain of salt as I very well may be wrong

I think you're right. Iirc my prof said that too. And rabies can actually last up to 10-15 years before taking effect so vaccines after exposure is plausible, however as we all expect from a manhwa taking place yeaaaars ago, it's not accurate.
There is also prep or pre-exposure prophylaxis if you want a vaccine before getting exposed to rabid animals. When you do get bit by a rabid dog, you want to get vaccinated within 1-3 days and the vaccine you get is erig or equine rabies immunoglobulin which is actually from a horse and not a dog lol. Or an hrig (human rabies immunoglobulin). Just learned this a few weeks ago lol
Is the vacine legit?