Former Hong Kong gangster Roy returns home after three decades of exile in Brazil, hoping to settle some unfinished business before he dies. Affected by Alzheimer's disease, he hires young thug Smokey to act as his guide and helper as he searches for the man who put a bullet in him and stole the love of his life. Traveling through the Hong Kong underworld together, the two men form a close bond as they discuss their idealized loves and missed opportunities.
| Actor | Role |
|---|---|
 Nicholas Tse Ting-FungSmokey | Smokey |
 Eric Tsang Chi-WaiRoy 'Mountain Leopard' | Roy 'Mountain Leopard' |
 Shu QiAh Nam | Ah Nam |
 Kelly Chen Hui-LinPolicewoman | Policewoman |
 Sandra Ng Kwan-YuThird Sister | Third Sister |
 Anthony Wong Chau-SangBrother Kei | Brother Kei |
 Terence Yin Chi-WaiBrother Chai | Brother Chai |
 Stephen FungMountain Leopard in '70 | Mountain Leopard in '70 |
 Sam LeeNine Dragons in '70 | Nine Dragons in '70 |
 Tony HoMad Dog Wah in '70 | Mad Dog Wah in '70 |
 Elaine Jin Yan-LingSmokey's Mother | Smokey's Mother |
 Jo Kok Cho-LamDee Dee | Dee Dee |
 Vincent Wan Yeung-MingBrother Wah | Brother Wah |
 Michael Chan Wai-ManNine Dragons | Nine Dragons |
 Vincent Kok Tak-ChiuNot listed | Not listed |
 Stephen Tung WaiGui Jian Chou in '70 | Gui Jian Chou in '70 |
 Cheung Tat-MingMaster Twelve in '70 | Master Twelve in '70 |
 Jazz Lam Tsz-SinBlondie | Blondie |
 Steve Wong Ka-KeungNot listed | Not listed |
 Gary Mak Wing-LunNot listed | Not listed |