The eight hidden clans, Mu, Ma, Xiong, Cai, Chang, Dai, Bai, and Zhang, live in the cracks of the modern city. Each has its own secret arts and hides behind an ordinary business: a gardening company, a local courier service, a foundation engineering firm, a biotech company, an image consulting agency, a big data service, a security technology company, and a counseling practice. They guard a thousand-year-old secret: the century-long pact.
