I'm not a hyundai expert by any means, but with the hondas I've owned and worked on, there's a fuse that controls interior lights ("courtesy" and "accessory" are two separate circuits so there'd be a fuse for each; door lights are considered courtesy lights in Japanese cars AFAIK).
Seeing that it's just one of the two lights that went out, I'd check the bulb. It could be the jamb switch, but probably isn't that deep, given MY luck... (https://r.tapatalk.com/shareLink?sh...rums.com/showthread.php?t=629290&share_type=t)
Sounds like the bulb is burned out.
Only way to change it is to pull the door panel off.
Not real hard but it is a pain to have to pull the entire door panel off just to change a bulb.
I plan on installing LED bulbs so I don't have to worry about filament bulbs burning out so quickly.