Hyuk was born 6 months earlier than Hae. Entered the company 1 year earlier than Hae. Will enlist and be discharged earlier than Hae..Maybe so that Hae won't be lonely..Okay, I'm somehow calm about them not enlisting and be discharged on the same date.

It's already September. I only have a month..ㅠ ㅅ ㅠ

So:

Hyukjae will enlist on 13th October 2015 and will be back on 12th July 2017

Donghae will enlist on 15th October 2015 and will be back on 12th July 2017