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The Demon King rules a feared empire, while his children fight for the throne in brutal succession wars. Unknown to them, a secret heir exists—born from a forbidden union and hidden away because he was deaf. His mother erased his identity and hid him from the royal family. Raised in silence and isolation, he learns to survive by watching, reading lips, and sensing everything others miss. While the empire tears itself apart, the Silent Heir waits in the shadows.