Irene, a dedicated nurse battling PTSD, finds herself thrust into a challenging new chapter of her life when she's selected to participate in a Military Training Program in Busan Province. Struggling with the weight of her mental health condition and haunted by traumatic memories, Irene grapples with the daunting prospect of fulfilling her duties in an unfamiliar environment. As Irene navigates the rigorous demands of the training program, she crosses paths with Lisa, a spirited trainee with a captivating presence. Despite Irene's initial reluctance to form connections, she finds herself drawn to Lisa's warmth and understanding.