Since ancient times, there has been a mysterious legend. There is a secret organization in the universe. Its goal is to maintain the balance of the universe. Every 500 years, it will gather some suitable people on the earth to join. It is said that those people will disappear from the earth inexplicably, never arousing the suspicion of the people on earth. The organization has always adhered to the rules of maintaining secrecy and security, and there has never been any oversight. Until--