
How do you say dokja because I’ve been calling him dojega and I wanna fix myself

It technically is but to shorten the explanation and to make it easier to be understood, saying the j as a y in this case will make it easier. But in terms of the Korean alphabet the j and y sound are very similar, so for a person who don't speak Korean or know the characters, the differences in the letter aren't that huge.
Hence why I stated that the ja could also be pronounced as ya. Being a non Korean speaker(or just any language), it is easier to show a demonstration of what one already a certain word is pronounced to structure another word you're unfamiliar with, just to have a base to start from yk
Bro I’m about to start tweaking up in this bitch why is bwat always releasing bangers?????
right? You either love the manhwa or you LOVE the manhwa