In a world where BTS is more than just idols, they run a secret underground mafia organization hidden behind their entertainment empire. Years ago, their youngest brother, Taehyung, was kidnapped by a rival group and raised unaware of his true origins. Now independent, with nothing but a locket of his mother as a clue, Taehyung crosses paths with his brothers-but not everything goes smoothly. Misunderstandings, hidden truths, and a war with their past unravel the journey of reunion, forgiveness, and sacrifice.