Hong Kong's gambling champion Cool (Louis Koo) was once boundlessly glorious, renowned for a card-flying stunt that shook the gambling world. In Asia, only Japan's formidable Tetsuo (Yasuaki Kurata) is seen as a true rival. Driven by a desire to be Asia's number one, Cool trains hard to sharpen his skills, convinced that he can finally beat Tetsuo.
But his ambitious path is derailed when his god-brother Yeung Kwong (Ben Lam Kwok-Bun) schemes to topple him. Yeung manipulates Cool's girlfriend Karen (Athena Chu Yan) and marries her, pulling a cruel trap at the wedding. Karen, however, sees through Yeung's plan and steps in to shield Cool. She is shot during the confrontation and falls into a coma, a fate that leaves Cool unable to rescue her due to Karen's legal marriage to Yeung. In response, Cool steps away from gambling and starts a Chinese restaurant in Japan, watching over Karen from afar as she lies unconscious.
Years pass, and a young, ambitious triad fighter named Jersy (Nick Cheung Ka-Fai) surfaces in Mongkok. Jersy idolizes Cool and longs to learn from him. After a gambling victory in Japan with his girlfriend Banana (Christy Chung Lai-Tai), Jersy stumbles into Cool's restaurant amid trouble with local gangsters. Cool and Jersy team up to clear the trouble, and Jersy learns Cool's true identity, forging a strong, if unlikely, friendship between them.
Meanwhile, the tension with Tetsuo intensifies. Tetsuo remains bent on challenging Cool to prove his own supremacy, but Cool has no desire to re-enter the gambling world. Yeung, desperate to see the two face off, hires Karen's younger twin sister from America to lure Cool into a setup during their anticipated duel, hoping to kill them and seal his plan. The move triggers a cascade of risk and resolve as Cool, torn between his vow and the chance to settle old scores, prepares for a confrontation that could redefine his legacy.
Desperate, Cool breaks his vow and engages in the epic, century-spanning battle against Tetsuo, pushing his limits in a duel that carries the weight of past betrayals, personal loss, and the possibility of redemption. Across both sides of the ocean, loyalties are tested, friendships are strained, and a man who once walked away from the spotlight must decide whether to risk everything for glory, healing, and the chance to finally lay old ghosts to rest.