I think it is a good thing to enlist in the army now. People needs time to forget about the drug case and 2+ years is good enough.
Joo Ji Hoon received the army enlistment noticed recently. He actually planned to enroll this month (December 2009) but due to various reasons, have postponed to next year February.
In the meantime, he has completed his community service sentence (for his drug case) on 19th August this year.
Source: mydaily / SINA / english brief translation by fangorn @ reikanorakuen.wordpress.com