She was the number one killer in the 21st century, but she committed a killer's taboo, fell in love with the person she shouldn't have loved, and eventually died at the hands of the person she loved the most! She thought it would end like this, but she didn't expect that this was just the beginning. When she woke up again, she became a baby. In this world where women are superior to men, as a boy at the bottom of society, let's see how she overturns the world and breaks out into her own world!