Black-bellied vs. Black-bellied: The Ultimate Showdown – Extra Collection, which mainly includes two story arcs: Binding the Heart and Year After Year.— Binding the Heart is an extra story about Song Puxin. The related plot takes place not long after Fu Yansheng first arrived in Shenzhen, during his long-distance relationship with Qi Yu. It recounts the events between Song Puxin and Si Ze during the investigation into the Si Corporation case, ending with Si Ze being sent to prison.— Year After Year is a story set five years after the conclusion of the main Black-bellied vs. Black-bellied narrative. It focuses on the confrontation between Qi Yu and Lin Huan, as well as Fu Yansheng's career development, while also revealing the fates of some supporting characters from the main story.