Da-kyung, who was an active member of a corporate criminal organization, belatedly learns of the death of her boss, whom she cared for like a mother, Times later without knowing why her boss's death, she gets a clue, a college of rich people with most of the children of important people in Korea. Da-Kyung will go back to being a student to try to find out what happened, she is a well-trained assassin, but dealing with bullying and the stress of school life may not be as easy as it seems... maybe she will also meet you, one of the coldest class representatives, perhaps more fitting to be called a walking refrigerator. No one knows what happened with your meeting with her later, whether you became enemies or friends? even though she may face bullying and the stress of school life, she still needs to return to being a student in order to find the answers she is looking for, so she prepared everything to get into that college.