After Marrying the Siren King, I Made His Son Speak

I die in a car crash and wake up in the sea kingdom as its despised queen, bound to a cold and merciless Siren King. Working as a child therapist, I help his mute six-year-old son find his voice, and little by little, I win over both father and child. But just when the boy is about to call me Mom, a woman with my exact face appears and insists she is his true mother.