Lt. Colonel Han Seungwoo

Lt. Colonel Han Seungwoo is an Alpha working in the Ministry of Defence. He is one of the officials. He belonged to the Reinforcement Department before exchanging post with Sooil. He is secretive and often acts on his own as a leader.

Background
He graduated from the National Military Academy and was an officer in the Defence Strategy Department before getting promoted.

Lee Jinhyuk
He has a good relationship with Jinhyuk despite Jinhyuk being sceptical towards him. He acts as a Reinforcement Officer and assists Jinhyuk before Wooseok came. During Wooseok's stay in Border and after Wooseok's comeback to the Ministry of Defence, he acts as Jinhyuk's partner.

Cho Seungyoun
Seungyoun is the subordinate he relies to a lot. The two are civil to each other even though Seungyoun has suspicions most of the time.

Kim Wooseok
He trusts Wooseok and is the reason why Wooseok stays in the Reinforcement Department.

Choi Byungchan
He pretty much pampers Byungchan even though he troubles Byungchan a lot when he needs to be in a meeting. Byungchan is a Recovery Officer but also an assistant to him.