Mo-chil Mu, He lived a normal life as a college student before enlisting in the Marine Corps, but in reality, he spent his childhood being teased by his friends for his introverted personality due to the trauma caused by domestic violence. In the meantime, he discovered the desire for 'reckless behavior' inherent in his childhood and kidnapped a friend, but was selected by the Assey Capture Team led by Cheol-gon Park and became a Marine.