Librarian of Utopia

In the dark interrogation room: "Name?" "Su Zhe." "Gender?" "Male." The reply was weak, which made the prosecutor look curious. At this time, Su Zhe on the opposite side was like a deflated rubber ball. No one could believe that he was the murderer. "I'm very curious about how you killed him - a swordsmith who disappeared for almost thirty years." Su Zhe was silent for a long time, and only responded to the interrogator with blank eyes.