Yu Chau can be a cop who has gone deep under cover inside the triad. He will tell which side of this law he is on. He runs off into the boonies to lick his wounds, After he accidentally kills one of the pals in an surgery. He teams up with Jackie and fellow officers Jim to grab a tri-ad Boss, simply to unveil collusion. Yu Chau yet again faces the issue of accepting the law into their own hands...