After a Woman Disguised Herself as a Man and Entered the Military Academy, She Couldn't Escape

In order to raise medical expenses for her brother who was in a vegetative state and was injured in a car accident, she took over the job of enrolling a rich second generation into the military academy. She originally thought that she would only need hard training, and left with a huge salary when the rich second generation didn't need her. However, she gradually discovered that her three roommates were staring at her like hungry wolves, and even her brother who had been protecting her for 17 years began to feel uncomfortable...