Known as the “Poison Princess,” the fourth princess Cecilia was shunned even by her own family. The only person who ever offered her a gentle smile was her older sister, Aria, the Second Princess. But that trust is betrayed in the cruelest way: on Aria’s command, Cecilia is captured and executed by Daniel, her sister’s most loyal knight. At the very moment death closes in—betrayed by the sister she trusted most— time rewinds. Awakening in the past, Cecilia makes a vow: “I’ll make that woman taste the same hell she put me through.” Driven by vengeance, she visits the slave market. There she finds the man once bound to her death—Daniel, shackled and sold as a slave. “I’ve finally found you…” She purchases him and coldly commands: “Assist me in my revenge.” Hatred? Forgiveness? Or perhaps… love? A betrayed princess and the deadliest knight-slave who once killed her. A dangerous and beautiful master-servant romance, tied together by poison and chains, now begins.