The royal advisor of the dynasty, the ordinary demon-locker, the reincarnation of cause and effect, the entanglements in this life, and the eighteen-year search, finally met after looking back. The world is so vast that it contains all kinds of strange things. They have turned into human forms due to love and hatred. A demon-locking sword watered with blood and tears, will it cut off the past or the future? No one can comment on who is wrong and who is right. All the spectators are just passers-by after all.