Sean Gilman’s review published on Letterboxd :
The Other Tony Leung plays the new guy, sentenced to three years for accidentally getting a jerk who had skipped out on the check at his father's restaurant run over by a bus. Leung is great, tall and skinny with oversized glasses and a look of constant, terrified bewilderment, but his character is unrealistically naive, if not outright stupid. Chow Yun-fat, a veteran prisoner with a happy-go-lucky attitude attempts to show him the ropes (generally leading to Chow slowly shaking his head in resigned disgust as Leung ignores his wise advice). At one point, Chow explains that they're in the jungle: Chow's the monkey and Leung's the lamb, but Leung doesn't seem to get the point, he keeps trying to impose outside standards of honesty and forthrightness to the prison world. The two run afoul of the local tough guy as well as an evil prison guard (Ho Ka-kui and Roy Cheung, respectively, both of whom are fantastic and menacing, Cheung with teeth-gritting, bug-eyed intensity and Ho with glasses, a slight paunch and utterly conscienceless), leading to some intense and violent confrontations. Both stars get to flip out in slow motion, it's pretty great.