Kim Ji Won as First Lieutenant Yoon Myung Ju is She is not only a soldier but an army surgeon and an orthopedic specialist. She is also the daughter of Lieutenant General Yoon, commander of the South Korean Special Forces Brigade. She follows her father's footsteps and graduates from the Korea Military Academy before doing an internship at Haesung Hospital with Mo Yeon. At her first assignment she meets Dae-young, a sergeant with a GED background. For the first time, she regrets being a soldier but refuses to back down. She is truthful with her feelings, and in order to protect her love she is willing to endure any danger and face everything straight on.