1. Identity of the protagonist: The male protagonist Wu Gaokun is a 28-year-old construction engineer with a rational and pragmatic personality, good at spatial analysis and crisis response; the female protagonist Wu Gaolin is a 25-year-old graduate student in the Department of History, with delicate sensibility and proficiency in ancient document interpretation and folklore knowledge. The two are unrelated siblings from a reorganized family, and their relationship is close and complementary.
