Yang Wei: An introverted academic. His father is a history teacher. He has old files from Qingyan High School hidden in his home. He is naturally sensitive to school legends. Later, he became tough due to carrying secrets.
Li Yao: An outgoing reporter. Her grandfather was the administrator of the laboratory building (disappeared in 1943). She carries with her the copper key left by her grandfather (which can open the underground secret room of the laboratory building). Her personality has changed from impulsive to cautious.
