A strange letter awakens the memory of her past life. It doesn't matter anything else, the most important thing is that she was a boy in her previous life! This shocked her, who had been a girl for eighteen years. When I met a boy I once liked in school, I followed him wherever I went in the past and now I avoided him at first sight. Brothers from the past life are gathering together, just to find her? The boy next door who I haven't seen for three years is actually a mortal enemy in the previous life? The seemingly ordinary world is still turbulent, and the mastermind behind the scenes is about to appear. In order to protect her brothers, she has no choice but to return.