At 10 million won that comes to about $9,000 (and 90 million won is closer to $80,000). Figure he's going to need at least $36,000 of that for basic living expenses over 3 years (probably more). So he's looking at an absolute housing budget of like 40 grand.
According to this renting a 1 bedroom apartment outside of Seoul will set you back about about $630 a month so $22k over 3 years. So I guess that's doable.
Buying might have been a little tough for him though. If that's what he did he must have found a place downwind of the city Sewage treatment plant or something.
Either way betting his future on a videogame with such an insane price required to even be able to play seems a little... What's he supposed to do if Royal Road goes under?