Kim Soo-jin, the woman who opened my eyes to the castle! But as soon as I enlisted, I put on my rubber shoes upside down… with the huge US Army…!! Unable to forget her hot night with her, she suddenly became a troublemaker and a disgruntled soldier in her unit. Then one day, Sohee’s older sister, whom she had a crush on when she was young, started to visit her. Became her older brother’s girlfriend…!!