The sensational discussion made the disappeared Butterfly Sword once again become a hot topic among people. The disappearance of innocent lives also made more people pay attention to the murder weapon that no one had ever seen. But is it really the weapons that kill people? Joys and sorrows, love and hatred, only last one life. But does it mean that the greater the desire, the greater the hope of getting it? There is never eternity, and what we are today is always more or less different from who we were yesterday. And that narrow sense of heart does not distinguish between gender and age. The beginning and end of everything are fate, just look at the depth... It seems like a sword but not a sword, it seems like it is not seen.