Actor Kim Woo Bin's label SidusHQ told news outlets through an official statement on January 26 KST, that the actor has received an exemption from South Korea's mandatory military service. 

The label said, 

"Kim Woo Bin was diagnosed with nasopharyngeal cancer in May of 2017, and then received a summons from the military manpower administration just shortly after wrapping up his radiation treatment. Afterward, he underwent a physical examination, and as a result was determined unfit to serve in the military, ranking in grade 6 in manual ability classifications. 

Currently, Kim Woo Bin has finished receiving his main treatments, and is reporting in for regular checkups, making efforts to recover fully. We ask for your abundant support and encouragements so that Kim Woo Bin can greet you healthily in the future." 

We hope to see Kim Woo Bin soon!