Gang-cheol's mother suffering from dementia. Her subsequent diagnosis of kidney failure and need for an expensive organ transplant serves as the primary catalyst that forces her son back into the criminal underworld.
Criminal authority indirectly endangers the protagonist's mother.
Gang member whose actions threaten the protagonist's mother.
Friend of the protagonist connected to his mother.
Mother and romantic interest sharing the protagonist's life.
Explore the full interactive character relationship map of Tough as Iron