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You can watch Heroic Duo (2003) for free on Kanopy.

Tough cop Ken Li (Cheng) is at the top of his game, but he's going to need some help to solve a grisly crime that the offender, a respected police officer, doesn't even remember committing. He seeks out Jack Lai (Lai), a former psychologist now in disgrace and behind bars, who has an uncanny ability to bend people to his will. Making an uneasy truce, this unconventional pair set out on a mission to find the man responsible, a master of hypnotism who will stop at nothing to get his revenge!

A fractured psychological landscape meets the brutal reality of a crime scene where the killer lacks any memory of his violence. This partnership between a relentless detective and a disgraced inmate turns the investigation into a tense battle of mental manipulation.