On June 14, Jellyfish Entertainment revealed the results of Seo In Guk's re-examination. It's concluded that Seo In Guk's diagnosis with Osteochondritis dissecans, a joint disorder in which cracks form in the cartilage and underlying bone, puts him in a grade 5 health rating. 

Grade 5 health rating is deemed unfit for military duty, which then means Seo In Guk's health condition does not qualify for enlistment.  

[SEEALSO]http://www.allkpop.com/article/2017/06/seo-in-guk-gets-results-of-medical-re-examination-for-military-duty[/SEEALSO]

As a result, Seo In Guk will not have to complete his mandatory military service. 

Back in March, the singer-actor enlisted in the military but was shortly sent back home during training due to an osteochondral lesion.