Yang Wei: An introverted top student whose father teaches history. His home holds old records from Qingyan High School, and he has a natural sensitivity to campus legends. Later, the secret he carries makes him more resolute.
Li Yao: An outgoing reporter. Her grandfather was once the caretaker of the laboratory building, but disappeared in 1943. She always carries the copper key he left behind, which can unlock the building’s underground chamber. Her impulsive nature gradually gives way to caution.
