LAW LIK-AH (Kevin Cheng) used to practice law for personal fame and glory but after setting up a Legal Advice Centre with his cousin GEORGE MIKE JR. (Lam Chi Sin) and his good friend TING KA-FU (Sam Lee) in Sham Shui Po, LIK-AH changes his mind and realises that legal representation is not only a privilege of the rich.

Soon, LIK-AH becomes the Peoples' Hero of Sham Shui Po, helping grassroots groups fight against injustice with unconventional tactics.

On the other hand, barrister WONG SZ-FU (Myolie Wu), who used to admire LIK-AH for his invincible performances, starts to disdain him for downgrading to a ghetto lawyer. However, after a few court cases with him, the two start to appreciate each other and fall in love.

Besides succeeding in her relationship, SZ-FU tries to become an elite practitioner in town. In order to gain advancement, she seizes every chance to get close to the renowned barrister TSEUNG PAK-KEI (Shek Sau). As PAK-KEI enjoys getting people into trouble, he makes sure SZ-FU is accidentally embroiled in a lawsuit.

In order to save SZ-FU, LIK-AH has no choice but to challenge the law.