Captain of the Taebaek Unit Company Commander of the Mouuru Unit In a relationship with 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 Representative Quotes: "If you're a doctor, you must not have a boyfriend. Because you're too busy." "Should I apologize, or should I confess?" "Big Boss transmitting. 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) within the unit. He was originally the Commander's choice for a son-in-law, but thanks to the absolute opposition(?) of Yoon Myeong-ju and Yoo Si-jin, Myeong-ju was able to marry Dae-young. Extremely close with Dae-young both privately and professionally. Call sign: Big Boss (Officer)

Professor in the VIP ward of Haesung Hospital In a relationship with Si-jin According to Yoo Si-jin, she is sexiest when performing surgery Representative Quote: "If you're a soldier, you must not have a girlfriend. Because it's too tough." Doctor Call sign: Pretty Girl

Deputy Company Commander of the Mouuru Unit Sergeant First Class of the Taebaek Unit Newlywed 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 his love. Overflowing with charisma. Representative 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 I was sorry." As a soldier, he uses formal military speech (da-na-kka) within the unit. Extremely close with Si-jin both privately and professionally. Melts instantly for Myeong-ju. Call sign: Wolf (Non-commissioned Officer)