The story of "The Gangsters 2: The Return of the King" describes how Brother Ren (played by Wang Shih-hsien) faces his former good brother, Liu Jian (played by Zou Zhaolong), who has "changed his ways" and become his "most loyal enemy", reappearing in the underworld, constantly provoking disputes and conflicts, destroying Brother Ren's patience and the peace he has worked hard to maintain. Seeing Liu Jian's business empire gradually expanding and his brothers around him making sacrifices for friendship, Brother Ren can no longer hold back and releases the beast in his heart, and officially goes to war with Liu Jian, who is both his enemy and friend, setting off a bloody battle in the underworld.