Jeon Rio(y/n) A stubborn yet kind secret agent, she's only 5 y/o when his dad decided to train her to be part of his team, at first Rio protest because she don't want to be hurt and also she don't want to kill anybody but everything change when her brother Jeon Jungkook died because of the mission he had And now, her dad assign her to protect these two groups of girls who had a not so good attitude Can she protect them? And can she also protect her heart from falling in love with them? Who will she choose? Then let's find out...