From their childhood to becoming the top two figures in the mafia, Ho Kei Song and Lau Cheuk Nam have stuck together through the thick and thin. When Lau Cheuk Nam was imprisoned for killing a cop, Ho Kei Song helped him look after his mistress, So Yau Lam. But Ho Kei Song and So Yau Lam secretly get married behind Lau Cheuk Nam's back. Soon after, Ho Kei Song retires from the mafia and opens a food business, living a plain life with his sister-in-law and daughter, Ho Foon Sam, from his previous marriage. Lau Cheuk Nam gets released early and turns to Ho Kei Song for support. Their brotherhood is tested, and it even fractures Ho Foon Sam's relationship with her boyfriend. As the family is falling apart, Lau Cheuk Nam persuades Ho Kei Song to make a comeback in the mafia. His ex-wife reappears again after having been missing for many years and reveals an unknown secret. Everyone becomes implicated in a nerve-wracking mafia fight.
- Native Title: 火線下的江湖大佬
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