Ark exam

Fifteen years ago, an accident occurred in the underground laboratory of Linjiang University, codenamed "Ark." Nine experimental subjects vanished, the files were sealed, and the project leader, Ji Yuanshan, was presumed dead. Fifteen years later, a flight of stairs disappeared from the teaching building—not collapsed or broken, but as if someone had erased it from space with an eraser, leaving a section as smooth as a mirror. A student who had been missing for seven days suddenly appeared in the morgue of a funeral home. After waking up, he repeated the same sentence over and over: "The exam is not over yet." Meanwhile, national security removed a person from prison. Ji Zhun, twenty-two years old, is a prisoner in custody, charged with hacking into the national nuclear industry database. His real purpose is to find his father, Ji Yuanshan, who has been missing for fifteen years. He Guozheng pushed a stack of photos in front of him. "The disappearance of the stairs started in the building where your father worked. You decide for yourself." Ji Zhun picked up the photos and looked at them for three seconds. "Give me the key." "What key?" "The one I found on that student. The one with 9 engraved on it." He Guozheng was silent for a few seconds, then placed the key on the table. Ji Zhun clutched it tightly, stood up, and walked toward the door. "Where are you going?" "Go downstairs." The last words Ji Yuanshan left for his son were written in the experiment diary fifteen years ago: "If you see the stairs going up, don't go up. Go down." Because down is the Ark.