[This is a short story] In the vast universe, the earth is just a small planet. With the development of human science and technology and the in-depth exploration of the universe, people have discovered that there are many planets in the universe that are similar to the earth and have the conditions for life to exist, thus confirming that there is not only intelligent life like humans in the universe.
In order to deal with possible alien threats, high-level officials of the country established the "Messenger Association" to recruit people with special skills and conduct secret cultivation and training in case of emergencies. One day, intelligence showed that a group of UFOs from the Zell star outside the Milky Way were heading towards the earth at the speed of light. Riots caused by suspected alien creatures disguised as human beings appeared in various places. The earth was in crisis. The Messenger Association quickly launched a defense plan, and a battle related to the survival of mankind began.
Purpose: The choice between personal love and the righteousness of the common people: Song Youhuan gave up his true love with Cui Hongyi and sacrificed himself to protect all mankind, explaining the choice and perseverance in the face of mission.