After his business collapses, Kyung-Min, in a fit of rage, commits a sudden act of violence against his wife. Concealing his turmoil, he reconnects with an old middle school friend, Jong-Suk, who now ghostwrites autobiographies but aspires to pen his own novel. Meeting for the first time in 15 years, they reminisce about their school days when they were marginalized as 'pigs' by the affluent 'dogs.' Unable to retaliate against their tormentors, they find solace in a fellow outcast known as the 'king of pigs,' Chul. As Kyung-Min unveils a long-buried secret from their past, the two friends confront the haunting truth of their shared history.