Wealthy heir Eli signs an attendant contract with Ryder, a dark werewolf hiding in the city, to settle his family’s debts. When the contract ends, Eli flees but is caught and imprisoned in an ancient castle. Samuel and Kyle step in one after another to fight over him. As werewolf hunters strike, Eli takes the chance to disappear. Half a year later, Ryder begins his remorseful pursuit. After countless entanglements, the two resolve their rifts and achieve mutual redemption.