Captain of the Taebaek Unit Company Commander of the Mouuru Unit Currently dating Kang Mo-yeon Loves teasing Seo Dae-young more than anything in the world Close with Myeong-ju as her senior from the Korea Military Academy Famous Quotes: "Since you're a doctor, you must not have a boyfriend. Because you're busy." "Should I apologize, or should I confess?" "Big Boss calling. Pretty girl, look behind you." The funniest character among the four, makes a lot of jokes. As a soldier, he uses formal military speech (Da-na-kka) at the unit. He was originally the Commander's choice for a son-in-law, but thanks to the desperate opposition(?) of Yoon Myeong-ju and Yoo Si-jin, Myeong-ju was able to marry Dae-young~ Extremely close with Dae-young both personally and professionally Call sign: Big Boss (Officer)

Professor in the VIP ward of Haesung Hospital Currently dating Si-jin According to Yoo Si-jin, she is sexiest when performing surgery Famous Quote: "Since you're a soldier, you must not have a girlfriend. Because it's tough." Doctor Call sign: Beauty

Deputy Company Commander of the Mouuru Unit Sergeant Major of the Taebaek Unit Newlyweds with Myeong-ju (Guest) Respects and fears his father-in-law (Commander Yoon Gil-jun) the most He used to push Myeong-ju away a lot, but after getting the Commander's permission and marrying her, he gives her all the love in the world. Overflowing with charisma. Famous Quote: "My operation was always a retreat. Because you, who are braver than anyone, loved someone as pathetic as me so much... I was grateful and sorry." As a soldier, he uses formal military speech (Da-na-kka) at the unit. Extremely close with Si-jin both personally and professionally Melts instantly for Myeong-ju. Call sign: Wolf (Non-commissioned Officer)