Yu-mi applies to a marine outfit to become their first female member. Finding out about their NO woman-policy, she pushes herself to the extreme and fils a petition. After overcoming many obstacles, she is finally accepted for her outstanding performance. However, conflicts never cease between sergeants and Yu-mi, who’s new to the tradition and culture of the marines. Following the sudden death of a trainee, Sergeant HA, she is appointed to the head of the team. Highly motivated Yu-mi loses her troupe's trust after losing IBS. The team is in danger of dissolution due to the loss of a magazine.

Discovering that the father, who was displaced from the North Korea, made a will to his lawyer that unless the two-divided Korea become unified, his veiled property is to be veiled property is to be donated to the country after his death, the whole family decided to fool their father into thinking that the unification is finally realized. However, their bold play doesn’t go smoothly always...