Where can I watch Gangster Payday in United States?

Wong Kam-Kwei, a gang boss on the decline, overseeing bathhouses and karaoke bars, falls for a small restaurant owner, Mei. He begins to help her business, and learns that Mei is already in love with Leung, a member of his gang. He’s also like a brother to Kam-Kwei. When a rival gang hoping to steal his territory kills Leung, the only thing left for Kam-Kwei to do now is to protect Mei and avenge Leung.