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I doubt anyone could've predicted how much Stephen Chow would blow up during the time this series was released. At this moment in his professional life, he was struggling to land roles. Both he and Tony Leung Chiu Wai started out at the same time, but Tony appeared to be a million miles away. It seemed there was no way he could catch him. But that all changed when Alex entered into his life and gave him that much needed push to get the ball rolling. And what a push it was, because Stephen is now pretty much out of sight of either of them in terms of box office success.
He was the wingman to Alex's main in this series. But now that his stardom has overtaken him, it was his image that dominated the posters and DVD covers, not Alex. Such is the harsh reality of business.
In terms of the performances, it's quite obvious to anyone that Alex did the best acting of the entire cast, playing a former gangster going straight. Stephen was pretty much just goofing around and hadn't quite acquired the rhythm and fluency that helped propel him into the big time just yet.