Set in the 90s, a Korean single mother raises her young son in the suburbs of Canada determined to provide a better life for him than the one she left behind.

Two violent inmates exercising their power over the prison VS the only chef in the prison kitchen who can possess weapons are admired for their hidden influence and both are unhappy with the king of prison in the cell. As a result, there is always extreme tension inside the prison. Meanwhile, Ki-cheol from the kitchen with a past ugly relationship enters the prison cell and a tense confrontation between the two cells begins. The increasingly tense situation in which the chaebol chairman in control of the prison and the head of the security department are involved, the battle has turned to determine the real king of prison.

Man-hee, imprisoned for being caught up in an accidental violent case, will be admitted to a violent room where the king of prison can be found. On the other hand, with Tae-soo, the opposition leader being admitted to the same prison, a group of people who are unhappy with the king gather one by one, and the gang members face a desperate crisis.