A cryptic message, "The door to Angel House will open," brings them into contact with the mysterious girl Xu Qian. Possessing the "Second Evolutionary Chain," which allows her to move at super-speed, the two encounter strange events on campus: disappearing classmates, hidden secret passages, and a mysterious force called the "Angel Organization." Following clues from the campus to an old suburban house, they discover that the Evolutionary Chain is divided into three levels, and Qi Mu's life story seems closely tied to the organization's conspiracy. As a solar eclipse approaches, they confront the organization's top brass, uncovering the secret war between the "Evolvers" and ordinary people. Their bond grows stronger through these life-or-death adventures, as they journey together towards an unknown destiny.