A male student's body is found at school. Authorities assume that the student killed himself in a fall. Other students at the school hold a trial to uncover the truth behind his death.

Driven by the desire to avenge his mother, a former gangster turned lawyer uses both his fists and the loopholes in law to fight against those with absolute power.

Drama series depicts the life of Hong Gil-Dong who is the the first revolutionist and dissident activist in Joseon.