Guardian of Blue Star, Signed in the Library for Twenty Years

Chen Fan traveled to the Blue Star in the parallel world, graduated from college, and became the librarian of Capital University. I originally thought that I would continue this boring nine-to-five life, but I was bound to a sign-in system, and I could get rewards as long as I signed in. Sign in at the Yandu University Library and receive the reward Knowledge Manager Civilized Master Archives; Sign in on the moon and get the reward celestial weapon - War Moon; Sign in on Mars and get rewards for landform transformation-Mars ecological recovery; ... In this way, Chen Fan kept checking in at the library for twenty years with a low-key attitude, but due to his profound knowledge, he was respectfully called the library sweeper by the students. One day, the main fleet of alien civilization arrived in the solar system across several light-years. The aliens' all-round crushing of technology made all mankind despair. Seeing that the alien fleet was about to reach the earth, Chen Fan knew that he could no longer keep a low profile... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.