Gwang-jang ( Mercy For None: Season 1 )

After Nam Gi-seok's mysterious death, Nam Gi-jun emerges from seclusion on a mission to find the perpetrator -- no matter the cost.

After tracking down Gi-seok's hit, Gi-jun discovers the scheme's origin -- forcing him to enforce a rule he established more than a decade ago.

Despite his father's precautions, Gu Jun-mo underestimates the threat he faces. Frustrated and desperate, he decides to handle Gi-jun himself.

Desperate to save his son, Chairman Gu digs deeper into Gi-seok's hit. After Jun-mo attacks his friends, Gi-jun goes head-to-head with Jun-mo's army.

Gi-jun quickly learns that his problems don't end with Jun-mo. A gang war breaks out after Chairman Lee suspects the real architect behind recent events.

Cha Yeong-do sets his plan in motion. As Lee Geum-son seizes power, Gi-jun faces betrayal, danger, and a race to uncover the truth behind it all.

With all his obstacles cleared, Geum-son puts his endgame into play. Will Gi-jun succeed in stopping him, or go down trying?