One night, defending his father from attack, he accidentally shoves a street thug in front of a bus.

Sentenced to three years in prison, Yiu is "fresh meat" for the hardened criminals and triad stooges that run things, and is preyed upon by sadistic guard Scarface (Roy Cheung).

The advertising designer Lo Ka-yiu is sentenced to three years of imprisonment in a Hong Kong prison for manslaughter.

He was convicted for pushing a man who had robbed the grocery store of his father onto a street under a passing bus.

Yiu observes how a member of the gang of triad boss Micky steals scissors from Ching (to use them as a weapon).

Following that Hung questions Micky, asking him to let his henchmen search for tools which went missing in the prison work shops (serving as makeshift weapons).

Since someone needs to be held responsible for the improvised weapons, Micky proposes to claim that Yiu blamed one of Bill's men.

Later the day Micky approaches Yiu in the laundry and demands a compensation for the punishment of his triad men.

Yiu keeps his opponents on distance with a sharp piece of broken glass until the guards arrive, but also accidentally hurts Ching with it.

Hung - who's also present during the inspection - denies the presence of triads among the prisoners and claims the two were having problems due to gambling debts.

Some time later, the members of Bill's triad initiate a hunger strike to protest against a price surge for cigarettes.

In the meantime the guards are alarmed by the noise of the fight, but are unable to take action since the absent Hung locked up the cell.