In 1980s Hong Kong, troubled youth Chan Lok-kwun, a mainland refugee, struggles to survive in the Kowloon Walled City by joining underground fights. Betrayed by crime boss Mr. Big while trying to buy a fake ID, he steals drugs from him and seeks refuge in the Walled City, where he encounters Cyclone, a compassionate yet authoritative crime lord.

YUM Investigation is a detective agency that specializes in the supernatural. With their new member Kojiro, the agency investigates a developer who dispatches evil spirits to scare away the residents of an old building. When they discover that the spirits were created by a sinister “spirit refiner”, the investigators must use every trick up their sleeves to crack the case.

Chung Lui Society is a boxing gym founded by former legendary Muay Thai champion Chung Lui, who is dedicated to training professional fighters. Despite the gym's struggles, he remains committed to his lifelong philosophy of never backing down from a challenge. Businesswoman Elsa discovers that her boyfriend Daniel is cheating on her with Macau's female champion, Surewin. Driven by her competitive spirit, Elsa vows to settle their score in the ring. Upon learning that Surewin was Lui’s former student, Elsa seeks him out to train her.

In one of his finest dramatic performances yet, Louis Koo stars as a veteran ambulanceman who simply wants to do his job without any interference from his boss. While he considers emigrating with his daughter, he clashes with his new partner, a young go-getter on the fast-track up the bureaucratic ladder. A mature directorial effort by Cheuk Wan-chi, this dramedy about Hong Kong’s civil service culture and the latest emigration wave is a charming, yet sobering love letter to her city and its people, especially those who still remain.