My Fake Son

Lyanna, sole heir of the dragon-blooded Northwood family, finds her "son" of 10 years is the bastard of her traitor husband Felix and his mistress Helena. Her real son Ethan was raised as a mute slave in stables, suffering endless abuse. She secretly trains Ethan into a dragon warrior, exposes their swap conspiracy and treason. Traitors meet fiery deaths. Lyanna becomes Kingdom General, and the true heir reclaims his birthright.