"In my world, you're forever mine." Sunoo, burdened by family debt, relocates from Busan to Seoul. A businessman offers him work for Lee Heeseung, leading to an unexpected proposal: marriage. Despite initial resistance, Sunoo relents. Little does he know, within Heeseung's embrace, he'll face his own personal hell. But Sunoo's lover, Sunghoon, intervenes to rescue him from Heeseung.