BalrogDeMorgoth
It's Korean manhwa, MC that dodge military mandatory won't look good in reader's eyes. And it's not easy to a normal citizen of SK without powerful backing to easily slip and not doing it. Even a big bb such as BTS made some news whether they should go or given a pass cause their popularity worldwide and have positive result econimically for SK. And how big the news can be, it's not purely by the topic itself, when political issue can be happened during that tike, those people like the ahtagonist might blow the news to cover some issue. It's common sense in there to use celebrity or murder case to overshadow news that they don't want to be look upon such as corruption. MC also tried to save money as much as possible, even if he got medical excuse, it's not 100% guaranteed pass but might enlist as social worker (iirc, a job that easiee than being in the military with mount of training).
In addition, 2 years is the maximum years to serve, if MC's group and MC himself doing exceptionally well, he might get award or some position, also vacation days + faster graduation (so it won't be full 2 years), a good one might also build connection (because the higher up use this chance to hire an outsanding/rare soldier)
It's either when you're still in uni or late in your job, but the later one can be pita as you'll lose your job especially if you're an easily replacable worker. More info already explained by Raven23
Sorry for bad english, I don't know if you already knew or not, still I want to reply to your comment in here
Oh, yeah majority don't like serving the military mandatory, so that's why they don't really like who don't do it like them (and feel the suffering lol), usually after they're done, it's like a thing that make them are proud too especially if they hold a title during their service time :3